In Git, HEAD is a reference to the current branch or commit that contains an immutable snapshot of the entire code base at a given time. It is like a pointer to any reference, and it points out the last commit in the current checkout branch. HEAD is stored in a file called .git/HEAD, and it can change depending on which commit youve checked out in your working directory. When you switch branches with the "checkout" command, the HEAD is transferred to the new branch. HEAD is not a commit; it points to one. It is generally simplest to think of it as the snapshot of your last commit. HEAD is used to refer to the current branch or commit in various Git commands.