Git is a free and open source version control system, originally created by Linus Torvalds in 2005. Unlike older centralized version control systems such as SVN and CVS, Git is distributed: every developer has the full history of their code repository locally. This makes the initial clone of the repository slower, but subsequent operations such as commit, blame, diff, merge, and log dramatically faster.
Git also has excellent support for branching, merging, and rewriting repository history, which has lead to many innovative and powerful workflows and tools. Pull requests are one such popular tool that allow teams to collaborate on Git branches and efficiently review each others code. Git is the most widely used version control system in the world today and is considered the modern standard for software development.Get started with Git
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Definition: Git’s way of referring to the current snapshot. Internally, the git checkout command simply updates the HEAD to point to either the specified branch or commit. When it points to a branch, Git doesn't complain, but when you check out a commit, it switches into a “detached HEAD” state.See All References