Modbus is a communication protocol that was originally developed for industrial automation systems, including the control of machinery, sensors, and other devices. It provides a standardized method for transmitting data over serial lines between electronic devices. Typically used for process automation in various sectors like manufacturing, utilities, and even building management systems, Modbus has become a de facto standard communication protocol that is now widely used for connecting industrial electronic devices. The protocol is known for its simplicity and ease of deployment, yet it's versatile enough to manage a wide range of devices and data types. Over time, Modbus has evolved to include variants that work over TCP/IP networks, further extending its reach and utility in modern automation systems.