Access control is a method for managing who can enter a location and when. The entrant could be an employee, visitor, or contractor, and they might be on foot, driving a vehicle, or using another mode of transport. The location could be a site, building, room, or office. This is known as physical access control to distinguish it from virtual access control, which restricts access to digital spaces, such as logging into a computer network. While enhancing security is a primary function, physical access control systems also offer numerous other benefits, including improved efficiency in business processes and better site or building management.