Do bikes have GPS tracking?

Excuse me, I was wondering if you could clarify something for me. I've been hearing a lot about GPS tracking these days, and it's got me thinking. Do bicycles, specifically, come equipped with GPS tracking systems? I know cars and some other vehicles have them, but I'm not sure about bikes. Is it a common feature, or is it something that you have to purchase and install separately? I'm just curious to know if I should be looking into getting one for my bike, or if it's not really necessary.