What is the purpose of a drain pan for a washer and dryer, and how does it help prevent water damage in the laundry room?

A drain pan for a washer and dryer is used to catch any water that may leak from the appliances. This helps prevent water damage in the laundry room by containing the water and directing it to a drain or a safe location, instead of allowing it to spread and potentially cause damage to the floor or surrounding areas.