The difference between localhost and vps

I am new learner in web development. My question is silly, but I am so confused about it.

1.Is localhost a server?
2.Does localhost originally exist in the computer or should be created using specific tool like wamp?
3.If localhost is a server, is it a vps?
4.Is here any simple and accurate definition of localhost and vps? 5.Is here any connection between vps and localhost?