A commit is a saved snapshot of changes in a version control system like Git. It records which files changed, how they changed, and a message explaining the update. Commits create a timeline that lets developers track progress, undo mistakes, and collaborate across branches. Each commit is identified by a unique hash, ensuring integrity and traceability.
Why it matters
Commits provide a reliable history of how a codebase evolves. They enable collaboration, code reviews, and debugging by letting teams pinpoint when an issue was introduced. Good commit messages and small, focused commits make it easier for AI coding tools and humans to understand code changes.
Examples
Running git commit -m "Fix login validation" creates a commit documenting that change. The lesson Making a Commit shows how commits fit into the Git workflow.