What is a Git branch?

A Git branch is essentially an isolated environment in which developers can work on changes without affecting the main codebase. It enables multiple versions of code to coexist, allowing developers to experiment with new features, fix bugs, or make improvements in a controlled manner. Each branch retains its own history of commits, which makes it easier to track changes and manage collaborative work effectively.

This is particularly useful in a team setting where different developers can work on their own branches. Once their changes are stable and ready, those branches can be merged back into the main branch, typically referred to as "main" or "master," without disrupting ongoing work. By using branches, Git allows for a more organized and efficient workflow, making it easier to manage and integrate complex changes over time.

The other choices do not accurately capture what a Git branch is. While comparing file versions is important in version control, it doesn't define a branch. Deleting unnecessary files pertains to repository management, not branching, and manual backups don't reflect the dynamic nature of branches and their commitment timeline in version control.