Circular knitting machines are specialized devices used in the textile industry to create knitted fabrics in a continuous, tubular form. They consist of a series of needles arranged in a circular configuration, allowing for efficient production of items like socks, t-shirts, and seamless garments. The machine feeds yarn through these needles, which interlock the threads to form the desired fabric. These machines can operate at high speeds, significantly increasing productivity compared to traditional flat knitting methods. They are versatile and can produce various stitch patterns and fabric types, making them essential for manufacturers in the fashion and apparel sectors.