A "commit" is a term commonly used in version control systems, such as Git, to describe the action of saving changes to a code repository. When a developer makes updates to a project, they can create a commit to record those changes along with a message explaining what was done. This allows for tracking the history of modifications and facilitates collaboration among multiple developers. Each commit creates a unique identifier, enabling users to revert to previous versions if needed. This process helps maintain the integrity of the project and ensures that all contributors can work together efficiently without losing important work.