What is Controller?

A 'controller' is a broad term in technology, generally referring to a device or component that manages, directs, or regulates the operation of other devices or systems. Its specific function depends greatly on the context. Examples include game controllers (input devices for video games), motor controllers (regulating motor speed and torque), PID controllers (used in industrial control systems to maintain desired process variables), and memory controllers (managing data flow to and from memory). In software architecture, 'controller' often refers to a component in the Model-View-Controller (MVC) pattern that handles user input and updates the model and view.