What and why?

What is Psychology?

  Acording to http://www.dictionary.com/, Psychology is:

1.the science of the mind or of mental states and processes.

2. the science of human and animal behavior.

Why is it important to study it?

       I think it is important to study psychology so that you know how a human mind functions, the consequences of things as in human minds, and this could work for you to learn to interact with people and have the results you want to have.