When should we use jQuery?

Answer 1

generally, you should try using pure javascript, but in big projects and not much time, it's so much faster to work with jQuery, also if you wanna use jquery UI features, like the accordion..etc
in short, use it when in a hurry or really need it

Answer 2

Whenever you need to do DOM manipulation with an easier syntax.

Answer 3

when you don't want to write a lot codes with short amount of time