If you’re new to industrial automation, you’ve probably come across terms like PLC, SCADA, and DCS  and thought: “They all sound important… but what do they actually do?” You’re not alone. These systems are often mentioned together, sometimes interchangeably, and rarely explained in plain English. In reality, they each play very different roles  in automation — and understanding the difference is key whether you're an engineer, technician, or just getting started in the indus