What is git checkout?

git checkout is a command in Git that allows you to switch between different branches or restore files in your working directory. Here are the primary uses of git checkout:

Switching Branches: You can use git checkout to switch your working directory to a different branch.
```
git checkout branch-name
```
Creating a New Branch: You can create a new branch and switch to it in one command by using the -b option.
```
git checkout -b new-branch-name
```
Restoring Files: You can restore a specific file to its state in a particular commit or branch.
```
git checkout branch-name -- path/to/file
```
Checking Out a Commit: You can also check out a specific commit by its hash, which puts your repository in a "detached HEAD" state.
```
git checkout commit-hash
```

Using git checkout effectively allows you to navigate through your project's history and manage different lines of development.