Direct digital control is a technique that utilizes computers and microprocessors to regulate and monitor building systems such as heating, ventilation, air conditioning, and lighting. There are several synonyms for direct digital control, including building automation, building management systems, and building energy management systems. These systems have gained popularity due to the increasing demand for energy-efficient and sustainable buildings. Other similar terms include HVAC controls, energy management controls, and facility management systems. All of these synonyms refer to the same idea of utilizing technology to create a more efficient and streamlined approach to building management. Direct digital control systems provide intelligent energy management, real-time control, and operational efficiency to commercial, industrial, and institutional buildings.