A countdown timer is a device or software that counts down from a specified time to zero. It is commonly used in various settings, such as cooking, sports, and project management, to help keep track of time remaining for a specific task. Countdown timers can be digital or analog and often feature alarms or notifications when the time is up. These timers are useful for enhancing productivity and ensuring tasks are completed within a set timeframe. Many devices, including smartphones and computers, come with built-in countdown timer functions. Additionally, specialized countdown timer apps are available for those who need more advanced features or customization options.