There are many advantages of using jQuery. Some of them include :
It is like an enhanced version of JavaScript so there is no overhead in learning a new syntax.
jQuery has the ability to keep the code simple, readable, clear and reusable.
It has Cross-browser support.
This would remove the requirement for writing complex loops and DOM scripting library calls.
jQuery helps in event detection and handling.
It provides tons of plug-ins for all kind of needs.