What is the use of CAPTCHAS?

[jasoncarly]

Hi,
Can any one tell me that What is the use of CAPTCHAS?
Thanks..........

[Tin]

Captcha can be a great help in downsizing or diminishing form spamming.form spamming is when bots go around the web, find forms and either hijack them-meaning they send thousands of spam emails through that form or - in the least - send at least one e-mail through that form.
Or, they fill in the form and sign up for hundred free e-mail accounts, or order hundreds of services and even products.

[tranhoang]

Is a tool against hackers who intend to steal some data. You imagine when a hacker uses the account registration tool on a web page, the overload leads to the web and the information in it is also lost.

[24x7servermanag]

Captcha are basically used for avoiding the spam account registration, hacking the account details and safe our-self from robots which are automated to just fill the registration or contact form to spared the spams around the network.

There are various types of captcha. Without verifying the captcha, you can not proceed. Those captchas provide the layer of security for your accounts.

[Nirala]

The captcha codes are used to restrict the robots to access the website or form

[zarinekhan]

Captcha is used stop spamming. and Security regards are used.

Thanks.

[gaiasagrada]

CAPTCHA or Absolutely Computerized Public Turing analyze to Tell Computer systems and People Apart is a strategy to differentiate between humans and computers.

[Walteradams]

The word CAPTCHA was first used by laptop or computer researchers at Carnegie Mellon School in 2000. CAPTCHA is actually an abbreviation that appears for Absolutely Computerized Community Turing analyze to tell Pcs and People Apart.

[davidsmith21]

CAPTCHA is mainly used as a security check to ensure only human users can pass through. Generally, computers or bots are not capable of solving a captcha.

[SKN]

Captchas are used for security purpose so hackers or robots can't get the access on the particular service.

[dljetarora]

captcha helps you to prevent your website from robots

[claireurias]

Captcha is a tool which is used to detect bot. It gives a confirmation to the site owner that the submission or registration which is made on your website was real human not a bot.

[rohit]

It is generally used to check whether you are a robot or a human being.

There are two basic alternatives on how to generate the content of the captcha

Submit a string that should be used
Automatically generate a random string. If this alternative is chosen then the user of the

[emmaaqueenn]

CAPTCHA or Completely Automated Public Turing test to Tell Computers and Humans Apart is a technique to distinguish between humans and computers. CAPTCHA is mainly used as a security check to ensure only human users can pass through. Generally, computers or bots are not capable of solving a captcha.

[simicartan]

CAPTCHA or Completely Automated Public Turing test to Tell Computers and Humans Apart is a technique to distinguish between humans and computers. CAPTCHA is mainly used as a security check to ensure only human users can pass through. Generally, computers or bots are not capable of solving a captcha.

[Anandkota]

It is to differentiate between Robots and human ,this is generally used for security issues to protect websites from hackers.

[davidweb09]

We use CAPTCHAS for SEO submission to stop the software/robots for website promotion. https://medium.com/@DomBowkett/new-york-citys-best-live-bands-for-your-wedding-1e1be5e5bd4e

[manishold]

CAPTCHA or Completely Automated Public Turing test to Tell Computers and Humans Apart is a technique to distinguish between humans and computers. CAPTCHA is mainly used as a security check to ensure only human users can pass through. Generally, computers or bots are not capable of solving a captcha.

[dombowkett]

We use captcha for SEO submission to detect either it's human or any SEO tools.

[amit.ncode]

Captcha is one the way to check real-time user is a robot or any program that accessing or using website.

[webxeros]

CAPTCHA is used to secure websites or forms from bots to reduce the spam rate. It is basically used as a security check to make sure no robots can surpass the website or forms.
Captcha works as an identifier between computers and humans.

[tony_S]

There are so called spam bots made to take links and email addresses from websites, forms, etc.

Like there are many protection ways against other harmful programs, the case with spam bots is also not an exception and nobody remains alone in the struggle against those programs.

There are some ways and systems that help to protect against spam bots and one of these ways is CAPTCHA. People who are going through web environment are familiar with CAPTCHAs, yet, let’s see what the acronym stands for: Completely Automated Public Turing Test to Tell Computers and Humans Apart. One can conclude from the expansion of the concept that it helps to get rid of bots by giving a test that is easily understandable to human beings and incomprehensible to bots.

Though most of the users consider answering number of cryptic questions or sorting out distorted texts and numbers in the frame of CAPTCHA tedious and frustrating, others think it is the most trustworthy and reliable way to prevent their forms from being spoiled by spam bots. Besides, with the advent of Google reCAPTCHA the process of passing a Turing Test has become easier and simpler. It requires nothing but a click on the checkbox.

I know a lot of web owners who use CAPTCHA for contact forms created in their WordPress websites to protect them from bots and I also highly recommend the same.

[softwaretesting]

CAPTCHA is an acronym that stands for “Completely Automated Public Turing test to tell Computers and Humans Apart”. Quite a mouthful. It was coined in 2000 by professors and scientists from Carnegie Mellon University and IBM.
A CAPTCHA is what is called a challenge-response test. One party presents a question or challenge and the other party must provide a valid answer or response in order to be authenticated.
CAPTCHA prevents spam in website comment sections and on blogs. Many spammers bombard comment sections with links to increase search engine rankings. The test makes sure only humans comment and users don’t have to sign in beforehand to leave a comment.
Many companies offer free email services but a while ago bots would sign up for hundreds of free accounts and then use these accounts to cause havoc on the Internet. Now people need to complete a CAPTCHA before being able to get a free email account. Free services should be protected by CAPTCHA to prevent abuse via automated scripts.
It offers protection from scrapers who want to copy the email addresses of users. Spammers would crawl the Internet for email addresses that are posted in clear text. By utilising CAPTCHA you can protect against these scrapers. People need to solve a CAPTCHA before an email address is shown.
Sometimes people don’t want a webpage to be shown so there is an HTML tag that hides the page from robots. Big search engine companies respect this but sometimes it doesn’t prevent all bots from coming through. This is what CAPTCHA helps to prevent.

[Drasti_Chavda]

CAPTCHA is a response test used in computing to determine whether the user is a human or not.

nopcommerce solution provider: http://www.ifourtechnolab.com/nopcommerce-ecommerce-solution

[Mangat Singh]

Captcha is used mostly to block spammers and bots that try to automatically harvest email addresses or try to automatically sign up for or make use of Web sites, blogs or forums.

[muslimastro]

great post by all. thanks

[theceo]

The Turing test that CAPTCHA refers to is a test that Alan Turing proposed in 1950 to show how much the intelligence of a machine could simulate that of a human, even if superficially the difference was imperceptible.


This method is still used in artificial intelligence. As in CAPTCHA, the test is controlled by a machine, in reality, a reverse Turing test is being used. The use of CAPTCHA exists on the Internet since 2003.

Typically, CAPTCHA consists of a person providing a series of distorted characters that are shown on the screen (similar to those shown in the illustration), so that only [in theory] a human can interpret them and not a machine. These words -which in many cases coincide with real words- are usually represented by an image, in such a way that their recognition has to be visual (or auditory, since some verifications give that option).

The purpose of a CAPTCHA is to deter hackers from using programs that automatically feed web pages. They do this for various purposes, such as trying to access an account by trying different passwords or filling out forms to create hundreds of email accounts, forgery of survey responses, create users automatically, among others.

It is estimated that the CAPTCHA tests have stopped around 90% of the attacks of hackers, although the latter employ increasingly sophisticated methods to cheat the CAPTCHA.

[xenelsoft]

Captcha is the basically used for the security reason that tell the user to select the security check.

[NoahKlindon]

CAPTCHA is basically utilized as a security check to guarantee just human clients can go through. For the most part, PCs or bots are not fit for unraveling a captcha.

[blackmagicislam]

interesting knowledge. you are shared.

[bmINDIA]

great information guys shared here

[bmINDIA]

Great post, usefull.thanks

[Mithzi Rai]

Hi,
Can any one tell me that What is the use of CAPTCHAS?
Thanks..........

CAPTCHA is mainly used as a security check to ensure only human users can pass through.

[vedicastrologym]

CAPTCHA or Completely Automated Public Turing test to Tell Computers and Humans Apart is a technique to distinguish between humans and computers. CAPTCHA is mainly used as a security check to ensure only human users can pass through. Generally, computers or bots are not capable of solving a captcha.

[nisargshah]

CAPTCHA stands for "Completely Automated Public Turing test to Tell Computers and Humans Apart"

It is mainly used to safety check and ensuring method that you are Robot or Human ....

computers are machines and they are not capable to answer the CAPTCHA itself.

[shakuntalavidya]

CAPTCHA or Completely Automated Public Turing test to Tell Computers and Humans Apart is a technique to distinguish between humans and computers. CAPTCHA is mainly used as a security check to ensure only human users can pass through. Generally, computers or bots are not capable of solving a captcha.

[AMFan102]

CAPTCHA stands for Completely Automated Public Turing Test to tell Computers and Humans Apart. The test is done for machines. The most important goal of captcha is to try the end consumer is human or machine.

[lilyjones]

Captchas are used to prevent spam and bot sign-ups.

[arianagrand]

CAPTCHA produces distorted texts which can be read by humans but not by automated bots. While they prove to be very useful, it is essential to know, when to use and when not to use them.

[johnfernandis]

CAPTCHAS are mainly used for reducing spams in websites. By spams, I do not mean manual spam, It means auto spam by bots as anyway human spamming will continue even after you use captchas.

[AndrewIva]

CAPTCHA or Completely Automated Public Turing test to Tell Computers and Humans Apart is a technique to distinguish between humans and computers. CAPTCHA is mainly used as a security check to ensure only human users can pass through. Generally, computers or bots are not capable of solving a captcha.

[shakuntalavidya]

CAPTCHA stands for Completely Automated Public Turing Test to tell Computers and Humans Apart. The turing test is performed for machines. The main purpose of captcha is to test that the end user is machine or human.

[Lady_Mabbey]

CAPTCHA is used to avoid bot/spammy signups! :)

[OrlandoHernande]

The technology is currently used mainly to block robots and spammers that try to mechanically harvest email addresses or try to automatically register for or make utilize of internet sites, forums or blogs. CAPTCHA, whose customers include Yahoo and Google, blocks automated systems, which can't read the distorted letters in the picture.

[Paro]

CAPTCHA or Completely Automated Public Turing test to Tell Computers and Humans Apart is a technique to distinguish between humans and computers. CAPTCHA is mainly used as a security check to ensure only human users can pass through. Generally, computers or bots are not capable of solving a captcha.

[yuva12]

CAPTCHA or Completely Automated Public Turing test to Tell Computers and Humans Apart is a technique to distinguish between humans and computers. CAPTCHA is mainly used as a security check to ensure only human users can pass through. Generally, computers or bots are not capable of solving a captcha.

[beingnaive]

Captcha is a tool that is used to ensure that there is a human accessing that page, where captcha is used. There are many benefits of sing captcha and use cases may easily vary, depending on the requirements of a specific page.
Most commonly used with forms. For instance, if you want to ensure that a genuine user is submitting the form, then you can use captcha.
Captcha can be of different types, and the most popular one is by google that may ask you to click a check box or identify certain images. People also generate captcha on their own which usually is a text written on an image, that robots can’t read but humans can.
The user input for captcha verification is then validated before posting the form.