The concept of process control dates back to the Industrial Revolution of the 1760s, when efforts began to automate tasks that were previously performed manually. Process control can be understood as the operational element of a unit process, enabling systems to be directed toward desired outcomes. It works alongside process equipment, which provides the physical means for operations to occur. Over time, process controllers have evolved to become more intelligent and integrated, often connected to plant-wide information systems that support advanced functions such as precise scheduling and automation. Effective process control is essential for monitoring, regulating, and responding to unexpected events, with systems ranging from simple manual controls to sophisticated computer-based controllers with feedback instrumentation.