A timer is a device or tool used to measure a specific amount of time. It can be mechanical, digital, or even a software application. Timers are commonly used in cooking, sports, and various activities where tracking time is essential. They help users manage their time effectively by providing alerts when a set duration has elapsed. Timers can come in different forms, such as countdown timers, which count down from a specified time, or stopwatch timers, which count up from zero. Many modern devices, like smartphones and computers, have built-in timers that can be easily accessed and customized for various tasks, enhancing productivity and organization.