Access control is for people and for vehicles. With the swipe of a card you can unlock a door or open a gate, whilst also switching on lighting or air conditioning or the reverse, switching everything off upon leaving.
Integrated access control with CCTV allows a camera to read and recognise number plates to allow access.
Access control is being increasingly used as a lockdown tool. With the push of a button, or from you smart phone, entire buildings can be secured in an emergency, keeping the people inside safe.