Dynamic+Web+Pages

What is the difference between a static and dynamic web page?
Individual web pages on any site are either static or dynamic.

A static page is one that can only be changed by logging into the server and replacing the page with a new version.

A dynamic page is one that updates based on the user - it displays content according to the user's needs. For example, an e-commerce website might display a list of products which might be of interest to one user, while displaying different products to a different user.

Dynamic web pages are becoming evermore popular. Sites like eBay and Amazon are good examples of dynamic commercial websites.

Task
List 5 other websites which are dynamic as opposed to static

Task
There are a number of programming languages which support dynamic website development. One of the most popular is Ajax. There are some[| simple Ajax code examples here]. Try 3 Ajax examples from the above site. Write a short description of what the code did, and how it could be described as "dynamic".