A surveillance camera is a piece of equipment used to project an image to a recording device or monitor. There are hundreds of different types of surveillance cameras on the market today which can be used to: Access control is a computerized way of giving a business owner the ability to permit or deny entry to any areas of their building or premises. An access control system modernizes the security of your location. Years ago this was done with door keys however it is now done with computer systems that will control how doors and locks are used and who they are used by.