Enterprise Plus is the Enterprise Rent a Car rewards program. Once you join you can start earning points and rewards for every rental that you make. Your points will never expire as long as you are an active member and you only have to make one rental every three years to stay in the program. The more you rent the more points you earn and the more rewards you receive. There are 4 levels of the Enterprise Plus program: Plus, Silver, Gold and Platinum. The higher your level the more rewards that you can qualify for.