CRM Potentials

New to a CRM.. once I convert my Lead to a Potential... if I say I closed the deal (Won), it continues to stay in the Potential Module..? Isn't there another place for these customers to go to? When I look at my Potentials, it has all the customers that have said no to a quote (Lost), the ones that have accepted a quote (Won) and the ones that are thinking about it.. this doesn't seem right??