What is Rest API?

Question

Hearing API connections in javascript and want to know more

Answer 1

Representational State Transfer Application Programming Interface

It's mainly used to read, write and modify wide range of resources comming from example from a cloud.
It's whildly used in front-end also backend javascript to query resources for various applications including desktop, mobile, embedded etc.

Answer 2

Thanks, and how I can establish connection in let say sharepoint..