In relation to a vehicle's structure, what does "unibody" refer to?

Unibody refers to a design where the body and frame of a vehicle are integrated into a single structure. This means that instead of having a separate frame and body that are bolted or welded together, the unibody construction uses a single piece or welded components, which enhances structural integrity, reduces weight, and often improves safety in the event of a collision. This design is common in modern vehicles as it allows for better fuel efficiency and improved handling due to reduced weight. The unibody construction is particularly effective in optimizing space within the vehicle while maintaining strength and durability.