Show the history of changes to the repository.
Your repository keeps track of every version that has ever existed. The log operation is the way to see those records. It displays each changeset along with additional data such as:
Who made the change?
When was the change made?
What was the log message?
Most version control tools present ways of slicing and dicing this information. For example, you can ask log to list all the changesets made by the user named Leonardo, or all the changesets made during April 2010.