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

Implements is used for Interfaces and extends is used to extend a class.

To make it more clearer in easier terms,an interface is like it sound - an interface - a model, that you need to apply,follow, along with your ideas to it.

Extend is used for classes,here,you are extending something that already exists by adding more functionality to it.

A few more notes:

an interface can extend another interface.

And when you need to choose between implementing an interface or extending a class for a particular scenario, go for implementing an interface. Because a class can implement multiple interfaces but extend only one class.