A web page is a single document usually designed in a programming language such as HTML or PHP. A web page is different to a web site because a web page is just one document of a collection that makes up a web site. A large web site such as the BBC web site could have thousands of web pages whereas a small mom and pop web site could have a few web pages. Below is example of a web page address,

http://www.internet-guide.co.uk/page.html