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The first feature to use AJAX is its interactivity by which it allows easier interaction between user and websites as there is no post back exists. You can save and get data without reloading the web-page by using AJAX.
Simplest and modern feature is its easier navigation, on the web-pages, to users without using back/forward button.
Multiple features can easily be used on a single web-page without using several web-pages. On a single page we can easily perform listing, insert and update of data by using not more lines of code.
AJAX keeps errors with the section through which it occurred and doesn’t affect other sections like a friend.