A Building Automation System (BAS) is a system that helps to automate the control of a building’s mechanical and electrical systems. It is designed to provide a comfortable and safe environment for occupants, while also helping to reduce energy costs. The BAS typically consists of sensors, controllers, and actuators that are connected to a network and managed by a software program. The system is able to monitor and control a variety of systems, such as heating, ventilation, air conditioning, lighting, and security. It can also be used to monitor and control other building systems, such as fire alarms, elevators, and access control. The BAS can be programmed to respond to changes in the environment, such as temperature, humidity, and light levels, and to respond to occupant needs. By automating the control of these systems, the BAS can help to reduce energy costs, improve comfort levels, and increase safety.