What is a hose bibb and how is it used in plumbing systems?

A hose bibb is an outdoor faucet that is connected to a water supply line. It is used to provide water for activities such as watering plants, washing cars, or filling buckets. The hose bibb has a valve that can be turned on and off to control the flow of water. It is commonly found on the exterior of buildings and is a convenient way to access water for outdoor tasks.