what is the difference between widget and plugin in wordpress?

do not know and i don't have ideas about them

A widget is a self-coded little bugger that you can drop into a widget area of your theme that will add some specific functionality or feature to it. A plugin works more in the back end and with the actual WordPress software. It adds extended functionality to the WordPress.

Widgets can come from plugins as well as just be embed into posts. A plugin can be anything