Car rental is a service that allows people to rent cars for a certain period of time. Avis, ALAMO, SEDAN, and Limo are all popular car rental companies. Avis is a four-letter company that offers a wide range of vehicles for rent. ALAMO is a five-letter company that provides customers with a variety of rental options. SEDAN is a five-letter company that specializes in luxury vehicles. Limo is a four-letter company that offers limousines for rent.