Denim and jeans are often used interchangeably, but they are not the same. Denim is a type of fabric that is made from cotton, while jeans are garments made from denim fabric. While denim is a versatile material that can be used to make different kinds of clothing, jeans are the most popular garments made with this fabric. Jeans come in different styles and cuts, ranging from skinny to baggy. Denim is also used for other types of clothing such as jackets, skirts, and shorts.