A stopwatch is a timing device used to measure the amount of time it takes for an event or action to occur. It has start, stop, and reset buttons.
Timer: Similar to a stopwatch, it measures time but may not have all the same features such as start/stop buttons.
Chronometer: A highly accurate stopwatch used for precise timing in scientific experiments or sports events.
Split Time: The time recorded by pressing the split button on a stopwatch while keeping the overall timer running.