URL stands for uniform resource locator. A URL is a
pointer to a particular resource on the Internet at a particular
location. For example http://www.ibiblio.org/javafaq/course/week5/exercises.html
and ftp://ftp.macfaq.com/pub/macfaq/ are both URLs.
A URL specifies the protocol used to access a server (e.g., ftp,
http), the name of the server, and the location of a file on that
server. A typical URL looks like http://www.ibiblio.org/javafaq/books.html. This specifies
that there is a file called books.html in a directory called
javafaq on the server metalab.unc.edu, and that this file can be
accessed via the http protocol. The full syntax is:
protocol://hostname[:port]/path/filename#fragmentID
The protocol, also sometimes called the scheme, is generally one of these