Here’s some basic info about Dojo Toolkit.
Demos | Docs |

Dojo Toolkit
- Set of JavaScript Libraries
- Client side technology , works with any Server side technology

- Supports AJAX
- Hides XMLHttpRequest processing
- Handle browser incompatibilities

- Handles Asynchronous communication through XMLHttpRequest
- Invokes “Event Handles” before and after an event occurs
- Provides markup based UI constructions through widgets
- Support animation

- Dojo libraries are organized as packages

- JavaScript events drive UI
- Events trigger AJAX requests
- Events allow JavaScript components to interact with each other