What is the purpose of AngularJS in asp.net mvc.?

Question

I have biggest confusion to choose my career.

any help me ..

 i'm a new to asp.net mvc development.

 

I have some questions regarding that.

 

1.Use of Entity Framework.?

2.Why do use jquery .? 

3.AngularJS Development.?

 

Can anyone suggest a couple of example.?

 

Thanks in advance