In the past, the more recognised term for this category of bikes was the 'hybrid'. However, today these bikes can being referred to as fitness and urban bikes, designed for general-purpose utility and commuting on a wide variety of surfaces, including paved and unpaved roads, paths, and trails. This category of bikes combines features from the road bike and the mountain bike, and includes variants such as the urban bike, comfort bike, folding bike and trekking bikes.
The lines between the variations are ambiguous, but they can be classified by the design goals. There are lifestyle bicycles optimized for commuting, for use in urban environments, or for use on a variety of paved and unpaved road surfaces. For some bicycle manufacturers, differences in hybrid type or nomenclature have more to do with marketing focus rather than design and specification, though specific features of certain hybrid bikes may suit one need better than another.