A Crossover is a multi-passenger vehicle with a unibody (car-like) construction. Although many automakers today use the terms SUV and crossover interchangeably, there are some technical differences. Crossovers can be any size from subcompact to full-sized. However, manufacturers often refer to a crossover as a small-sized SUV or compact SUV. One of the core aims of a crossover is to provide comfort in a vehicle that is rugged enough for difficult terrain.