Ports

Port is a group of pins on a microcontroller which can be accessed simultaneously or on which we can set the desired combination of zeros and ones. Actually, port is a register inside a microcontroller which is connected by wires to pins, where as port represents physical connection of CPU and the other circuts, devices and components.

Microcontroller uses them to monitor or control other components or devices. All port pins can be designated as input or output, according to what the devices need. Usually, microcontroller has at least two ports and each ports maybe has 8-bit register.