A cardigan sweater is a type of knitted garment that opens in the front, typically featuring buttons or a zipper. It is designed to be worn over other clothing, providing warmth and comfort. Cardigans come in various styles, lengths, and materials, making them versatile for different occasions and seasons. Originally popularized in the 19th century, the cardigan is named after the 7th Earl of Cardigan, who wore a similar style during the Crimean War. Today, cardigans are a staple in many wardrobes, suitable for both casual and formal settings, and can be found in a wide range of colors and patterns.