Human: I'm trying to decide which type of car to buy. I'd like to know what the difference between a sedan, coupe, Assistant: 
The main difference between sedans and coupes is in their body styles. Sedans have four doors and are typically longer than coupes, with more interior space. Coupes generally have two doors and are often sportier looking vehicles with more aerodynamic designs. 2 Another key difference is engine size. Sedans usually come with larger engines that provide better fuel economy, while coupes tend to be powered by smaller engines for better performance. 3 Finally, there's the matter of cost. Sedan models tend to be more expensive than coupes due to their higher level of features and technology.