PLC stands for Programmable Logic Controller, a specialized computer used in industrial automation to control and monitor machinery and processes. It is a rugged and reliable device that can withstand harsh environments and perform complex tasks with precision and speed. PLCs are programmed using ladder logic, a graphical language that allows engineers to easily create and modify logic sequences. They are essential in modern manufacturing, providing real-time data and control to optimize production and increase efficiency. PLCs have revolutionized the way industries operate, making automation and process control more efficient, accurate, and cost-effective.