The document provides an overview of building management systems (BMS). It discusses that a BMS centralizes and simplifies controlling, monitoring, operating, and managing building services like heating, air conditioning, ventilation to achieve a comfortable and safe environment while saving energy and operating efficiently. The document outlines the key components of a BMS including central workstations, field devices, and DDC controllers. It also describes various BMS features such as user interfaces, data presentation, security, reporting, alarms, scheduling, and remote connectivity.