A coin counter is a device designed to automatically sort and count coins. It works by sorting coins into separate compartments based on size, weight, or thickness, providing an efficient way to manage loose change. Often used in businesses, banks, or for personal use, these machines save time and reduce errors compared to manual counting. Some models also convert the counted coins into bills or provide a total value. Modern coin counters are typically equipped with features like digital displays, batch counting, and the ability to handle a range of coin denominations, offering convenience and accuracy.