A Commit Is a Deliberate Checkpoint
A version-control system does not normally record each keystroke as a separate historical event. Instead, a developer gathers related edits into a commit: a named checkpoint that captures the state of tracked files at that moment. The developer may first type, delete, and revise code many times; those unsaved-in-history steps remain part of the working draft until they are committed.
That distinction makes the history useful. A log filled with every typo and correction would be difficult to navigate. Commits let developers group changes around a meaningful task, such as fixing a bug or adding a feature, then describe that checkpoint so teammates can understand why it exists.
How the System Connects the Checkpoints
A commit records more than a snapshot of file contents. It also points to the preceding commit, forming a chain of project states. In many systems, the stored data is organized efficiently so unchanged content does not have to be copied anew at every checkpoint.
Because the checkpoints are linked, a developer can compare two of them to see what changed, or return the project to an earlier state if a new change causes problems. On a shared team, commits can be exchanged and combined, giving collaborators a common history while they work on separate changes.
The record is therefore detailed at the level of chosen checkpoints, not individual typing actions. If a developer makes ten edits before committing, the team usually sees one grouped change—not ten keystrokes—making the project’s history a practical map of decisions rather than a replay of someone’s keyboard.
