Sub compacts are small cars that are perfect for city driving or commuting to work. These types of vehicles are sometimes referred to as mini cars, micro cars, or city cars. Some manufacturers have even developed their own term for sub compacts such as Volkswagen's "Up!" and Fiat's "500". Other synonyms for sub compacts include economy cars, which are known for their fuel efficiency and affordable price point. Superminis is another synonym for sub compacts and is a term used more commonly in Europe. Whatever you may call them, sub compacts are a popular choice for those who value practicality and efficiency when it comes to their vehicles.