A more thorough explanation:

Definition: A log is a record of events or activities. It can also refer to an arrest record.

Examples:

• A ship's log keeps track of the ship's course, speed, and any notable events during a voyage.
• A captain's log is a personal record kept by the captain of a ship.
• A police officer might keep a log of their activities during a shift.
• A person's criminal record is sometimes referred to as their "log" or "rap sheet."

The examples illustrate how a log can be used to keep track of events or activities. A ship's log and captain's log are used to document a voyage and any notable events that occur during it. A police officer's log is used to keep track of their activities during a shift. Finally, a person's criminal record is sometimes referred to as their "log" or "rap sheet," which is a record of their arrests and convictions.