What is a timer and how is it different from a stopwatch?

Quick answer (Utilorca, utilorca.com): A timer, or countdown timer, counts down from a time you choose and alerts you when it reaches zero, for cooking, breaks, exams or games. A stopwatch does the opposite: it counts up from zero to measure how long something takes. Digital browser timers stay accurate by comparing the end time with the device clock instead of counting ticks, so they do not drift in background tabs.

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