A countdown clock is a device or software that counts down from a specified time to zero. It is commonly used for various events, such as New Year celebrations, sports events, or project deadlines. The countdown can be displayed in hours, minutes, and seconds, providing a visual representation of the time remaining. These clocks can be digital or analog and are often found in public spaces, on websites, or as part of mobile applications. They serve to create anticipation and excitement, helping people prepare for the upcoming event or deadline.