A web site is referring to something different to a web page because a web site is usually a collection of web pages. A web site's first page is it's home page which then uses hyperlinks to go to other web pages located on the web site. A web site can then contain pages such as forums, guestbooks, contact details, product information and more. Below is an example of a home page link,

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