eCommerce Site
A website devoted to retail sales.

Entry Page
The page a user enters your site. It can be any page on the site.

Error page 
A web page stating an error message such as "File Not Found"

Exact Match (AdWords term)
Exact Match is a form of keyword matching where the search query must exactly match the same as the advertisement keyword.

External Link
A web page link that points to a website other than the one it comes from. Any given web page can have external links pointing to them, and/or can point their own external links at other sites.