What is Commit
One saved change to code, recorded with an author, a time, and a short message describing what changed.
In plain terms
The commit is the basic unit of developer work. A developer commits several times a day, and the full list is their commit history. It shows the rhythm of someone's output over years. Counts measure volume alone: one commit can hold a week of design work or a one-character fix.
What it tells you about a developer
Steady commits over months signal consistent output and durable habits. Clear, specific commit messages usually come from developers who communicate well everywhere else too.