Denim is a sturdy cotton twill fabric, typically blue, that is widely used in the production of clothing, especially jeans. Its durability and versatility have made it a staple in casual wear around the world. The fabric is woven in a way that creates a diagonal ribbing, which gives it a unique texture and strength. Originally created for workwear in the 19th century, denim has evolved into a fashion icon. Today, it is available in various styles, colors, and finishes, appealing to a broad audience. Denim's ability to be dressed up or down makes it a timeless choice for many wardrobes.