An attendance counter is a device used to track the number of people entering or leaving an event or area. It is often used in places such as schools, stadiums, and other large venues. The two most common types of attendance counters are turnstiles and stiles. Turnstiles are mechanical gates that rotate when someone passes through them, while stiles are barriers that people must step over in order to enter or leave an area. Both devices are used to count the number of people entering or leaving a venue, allowing for accurate attendance records.