A UPS, or Uninterruptible Power Supply, is a device that provides power to electrical equipment when the power goes out. UPS units come in a variety of sizes and voltage ratings and are used in both commercial and industrial environments. Most UPS units contain batteries that allow them to provide power for a short period of time, usually between 10 and 60 minutes. This gives the users enough time to save their work and safely shut down their equipment. In some cases, UPS units also contain generators that can provide power for extended periods of time. UPS units are an important part of any backup power solution, and can help keep businesses running during a power outage.