What is the difference between Git and Github

Question

Git and Github has any difference ?

 

when we add any project to source control from VS2013 IDE then two option comes. one is TFS and another one is GIT. 

 

if we select git and when we commit and sync then we need to provide github project url.

so tell me can we give different publish url there other than github project url ?

 

please guide me about this word called Git. thanks