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## When the response is received from the server the callback function is called automatically.
## The callback function modifies a part of the page dynamically using DOM access methods.
== Ads ==
Popup windows with ads became so hated over the years that popup blocking became the default behaviour in all the popular browsers. But the motivations for displaying those popups have not gone away.
There are now two popular ways to display ads to the user of a webpage:
# The old-school banner ad, which can also take the form of text without images. This is currently the most popular and accepted form of advertising.
# HTML5 popups. These are not popup windows that would show up in your window manager but rather DIV tags that float over the normal content of the page. Sometimes the page content is blocked until the popup is dismissed and sometimes you can still interact with the page. Depending on the implementation of this - the reaction can range from quite acceptable to "get me out of here".
Almost always the HTML5 popup category has its content loaded using Ajax. It can be the simplest way to implement it and also it can allow the base page to load more quickly, and the ads will show up later after the user started reading the page they wanted to see.
== Ajax disadvantages ==
