An alarm clock is a device designed to wake people up at a specific time. It typically features a clock face or digital display that shows the current time, along with buttons to set the desired wake-up time. Many alarm clocks also have additional features, such as snooze buttons, which allow users to sleep for a few extra minutes before the alarm sounds again. Alarm clocks can be powered by electricity or batteries and come in various styles, including traditional analog models and modern digital versions. Some alarm clocks even include features like radio, nature sounds, or Bluetooth connectivity to play music, making waking up a more pleasant experience.