Implements vs extends: When to use? What's the difference?

Question

Please explain in an easy to understand language or a link to some article.

Answer 1

Those two keywords are directly attached with Inheritance it is a core concept of OOP. When we inherit some class to another class we can use extends but when we are going to inherit some interfaces to our class we can't use extends we should use implements and we can use extends keyword to inherit interface from another interface.