Web design is used as a general term to describe any of the various tasks involved in creating a web page. More specifically, it refers to jobs focused on building the front-end of a web page.
The web consists of myriad pages, presenting information using different technologies and linked together with hyperlinks.There are two basic aspects to any web page found on the Internet. The first is a presentation that the user interacts with, usually visually, while the second is a back-end that includes information for non-human browsers.
There are lots of designing software available to design a site. Some of them are Dreamweaver, Net-beans, Photoshop etc. The both are the most popular among professional web designers and developers.