Water pump?

My Service Adviser said that I need a water pump. What is it? What does it do? Why should I consider replacing it?

We at Advanced Auto Pros take your vehicle seriously and want to do our part to be sure that every car in Greeley is trouble free. One way that we do this is by checking your vehicle every time you bring your car in for potential problems. We may have recommended that you replace your water pump for a variety of reasons. We invite you to take 2 minutes and find out what those reasons may have been and what it means to you and your vehicles reliability.