A Remote Terminal Unit (RTU) is a type of industrial control system that is used to monitor and control remote equipment. It is a specialized computer-based system that is used to collect data from remote devices such as sensors, switches, and other equipment, and then send that data to a central location for analysis and control. RTUs are often used in industrial settings such as oil and gas pipelines, water and wastewater systems, and other process control systems. RTUs are also used in communication networks, such as cellular and satellite networks, to provide data and control functions. RTUs are typically used to monitor and control the operation of large, complex systems, such as those found in power plants, factories, and other industrial settings. RTUs are designed to be rugged and reliable, and are often used in harsh environments where other types of equipment may not be able to operate. RTUs are also designed to be flexible, allowing for easy integration with other systems and the ability to be customized to meet specific needs.