What is the definition of URL

[Dazzle]

A URL (Uniform Resource Locator) is a unique identifier used to locate a resource on the Internet. It is also referred to as a web address. URLs consist of multiple parts -- including a protocol and domain name -- that tell a web browser how and where to retrieve a resource.
End users use URLs by typing them directly into the address bar of a browser or by clicking a hyperlink found on a webpage, bookmark list, in an email or from another application.

[SamHobbs]

An URL is a type of URI as defined by RFC 3986: Uniform Resource Identifier (URI): Generic Syntax. URLs are defined by RFC 1738: Uniform Resource Locators (URL).

[taxiongo]

A URL (Uniform Resource Locator) is a unique identifier used to locate a resource on the Internet. It is also referred to as a web address. URLs consist of multiple parts including a protocol and domain name that tell a web browser how and where to retrieve a resource.

[SamHobbs]

A URL (Uniform Resource Locator) is a unique identifier used to locate a resource on the Internet. It is also referred to as a web address. URLs consist of multiple parts including a protocol and domain name that tell a web browser how and where to retrieve a resource.

I see that people tend to repeat the same thing many times here.

First, see BNF for specific URL schemes.

The first part of an URL is officially called a scheme. The format of the rest of the URL depends on the scheme. For the HTTP scheme the rest of the URL is officially defined as:

httpurl = "http://" hostport [ "/" hpath [ "?" search ]]
hpath = hsegment *[ "/" hsegment ]
hsegment = *[ uchar | ";" | ":" | "@" | "&" | "=" ]
search = *[ uchar | ";" | ":" | "@" | "&" | "=" ]

Note that an URL can have a search portion at the end, beginning with a "?". I do not see any previous response mentioning the search portion.

Between the scheme and the search portion the BNF syntax specifies the format hostport/hpath. (Those names are not official names, they are like variable names in a program.) The hostport is the part that includes the domain name and optional port. The hpath is the part that has directory names. Some server software and websites do not use the path as directory names directly; some websites route the URL through a controller that changes the actual location of the resource in the server. When you see a website developer mention MVC they are talking about Model View Controller and the controller part determines where each web page actually comes from. A Single Page Application (SPA) is another example of the path being used to change the actual location of where the web page comes from.

[onroadztours]

Uniform Resource Locator (URL) ths used for locate the address in internet