What's the difference between men's casual pants and trousers?

Casual pants are usually made of denim, synthetic fiber, hemp and other fabrics, and most of them are slightly straight, suitable for social occasions and general occasions; The fabric of trousers is usually cotton or elastic on all sides. Pants are wide at the top and narrow at the bottom, suitable for formal business occasions and banquets, and can also be worn in the office ... pants are more orthodox than casual pants.