Building automation most broadly refers to creating centralized, networked systems of hardware and software monitors and controls a building’s facility systems (electricity, lighting, plumbing, HVAC, water supply, etc.)
When facilities are monitored and controlled in a seamless fashion, this creates a much more reliable working environment for the building’s tenants. Furthermore, the efficiency introduced through automation allows the building’s facility management team to adopt more sustainable practices and reduce energy costs.
These are the four core functions of a building automation system:

To control the building environment
To operate systems according to occupancy and energy demand
To monitor and correct system performance
To alert or sound alarms when needed

At optimal performance levels, an automated building is greener and more user-friendly than a non-controlled building.   _{Your Comment}