Access control a is way of limiting access to a system or to physical or virtual resources. In computing, access control is a process by which users are granted access and certain privileges to systems, resources or information.In access control systems, users must present credentials before they can be granted access. In physical systems, these credentials may come in many forms, but credentials that can’t be transferred provide the most security.
A fire alarm is an electronic device made to produce audible/visual warning to residents if a fire is present. Most fire alarm systems are activated by smoke detectors, heat detectors, or fire alarm pull stations. A common misconception is that a “three-alarm fire,” for example, means that three firehouses responded to the fire.