A website is simply one or more "pages" of information grouped together under a "domain name". For example, "http://www.earthclick.net" is a website that defines the services that Earthclick.net provides to its customers. Generally, a website performs a specific function - a shopping cart, a company brochure, a directory of Real Estate listings, and so on.
Domains are a common and unique name used to identify discrete and related information on the Internet. A domain name is the most common representation, and looks like this: "domainname.ext" where "ext" is a Top Level Domain extension ("TLD") and "domainname" is the primary root name for the domain. These are examples of domain names: