What do the terms fork, master, origin, push, pull mean for Git and Github?

Question

What are the differences between the terms:

• trunk / branch / merge / check in/out (which I know from other VCS)
• fork, master, origin, push, pull, etc. (used by Git)

Answer 1

This first thing that is important to understand about Git is that it thinks about version control very differently than Subversion or Perforce or whatever SCM you may be used to. It is often easier to learn Git by trying to forget your assumptions about how version control works and try to think about it in the Git way.

-- http://gitref.org/