Difference between Queries ?

Hello all , I am Completely new for  dynamics ax technical .

-> What is Query ?

-> Why We are using Queries ?

-> What is AOT , Static , Dynamic Queries ?

-> At What situations we are using AOT , Static Queries , Dynamic Queries ?

-> What are differences between AOT , Static , Dynamic Queries

Please anyone explain simple and clear with one good example  .

Thanks

Dis is Divya .