Why Dojo Toolkit ?

Answer

• You can use Dojo to make your web applications more useable, responsive, and functional Supports AJAX.
• Dojo provides lots of plumbing facilities i.e.Hides XMLHttpRequest processing, Handles browser incompatibilities.
• Dojo provides powerful AJAX-based IO abstraction. What this means is that it handles asynchronous communication
  through the usage of XMLHttpRequest. Again this is called remoting.
• It provides hooks for backward, forward, bookmarking support.
• Its event system is pretty powerful, for example, it lets you to invoke your event handler before or after an event occurs.
  This is called “aspect-oriented” event system.
• It does provide markup based UI constructions through widgets. You can also build and reuse widgets that you built or built by someone else.
• It does support animation. And again, Dojo toolkit comes with lots of useful JavaScript libraries.