A PLC, or Programmable Logic Controller, is a rugged industrial computer used to automate processes in manufacturing and industrial environments. It monitors inputs and makes decisions based on a custom program to control outputs, such as machinery or equipment. PLCs are highly reliable and can withstand harsh conditions. They’re programmed using specialized software, typically in ladder logic or other programming languages. PLCs are widely used for tasks like controlling assembly lines, monitoring sensors, and managing complex operations in industries like manufacturing, automotive, and food processing.