In the wave of modern industrial automation, Industrial Control Systems (ICS) play a crucial role. They not only enhance production efficiency but also improve the safety and reliability of processes. Among the various ICS, SCADA, DCS, and PLC are three terms that are often mentioned but can be easily confused. This article will delve into the differences between these three and explore their applications in industrial automation. SCADA: A supervisory control and data acquisition system that allows for remote monitoring and control of industrial processes. DCS: A distributed control system that manages complex processes through a network of controllers. PLC: A programmable logic controller used for automation of electromechanical processes. Each of these systems has its unique features and applications, making them suitable for different industrial environments.