Cotton mills are industrial facilities where raw cotton is processed and transformed into yarn or fabric. These mills use various machines to spin, weave, and finish cotton products, making them essential in the textile industry. The process typically involves cleaning the cotton, carding it to separate fibers, and then spinning it into threads. Historically, cotton mills played a significant role in the Industrial Revolution, particularly in countries like England and the United States. They contributed to economic growth and urbanization, as many workers moved to cities for jobs in these mills. Today, cotton mills continue to operate, although they often incorporate advanced technology for efficiency.