Tridion core service difference between save create and checkIn methods

Question

I saw that there are different method to create a component using core service and a client like SessionAwareCoreServiceClient.

what is the main difference between .Save() and .Create() ?

Answer 1

Create is used to create new items only. It will perform Save + CheckIn.

Save can be used to create new, or save existing items. It will not check-out or check item in

Update will execute CheckOut + Save + CheckIn

Answer 2

If you do a create, you're actually creating a brand new item. If you do a save, you're either saving an existing item, or saving the new item that you've created.

Short answer, but I hope it clears up the confusion.