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Git is a distributed version control system, widely used in software development to manage and track changes made to code repositories over time. It was designed by Linus Torvalds for the Linux kernel project and has since become the de facto standard for managing source code collaboration.

Here's a brief overview of key concepts in Git:

1. Repository: A Git repository is a central location where all the files and their versions are stored. Each repository has a local copy on your computer, as well as a remote copy on a server or online platform like GitHub.

2. Working directory: This is the folder on your local machine that contains the latest version of the files from the repository. You can make changes here and stage them for committing.

3. Commit: A commit is a snapshot of the current state of your working directory. It includes all changes, along with a message describing what you've done. Commits are saved locally and can be pushed to the remote repository.

4. Branches: In Git, you can create multiple branches, which are separate lines of development. This allows developers to work on different features or bug fixes without interfering with each other's work.

5. Merge: When a branch is ready to be integrated into the mainline code, developers can merge the changes from one branch into another using `git merge`.

6. Pull request: A pull request is a way to propose changes to a shared codebase. You create a request on a remote repository, asking others to review and potentially merge your changes.

7. Stashing: If you need to switch between tasks but don't want to lose your changes, Git allows you to stash them temporarily.