CPUProcessor/ Central processing unit (CPU)/ System on chip (SoC)

Processor

A processor or processing unit in a mobile/computer  is an electronic circuit which plays the main role in performing the device functions.

Central processing unit (CPU) composed of processing unit and control unit.

System on chip (SoC) is an integrated electronic circuit which integrates all components of a computer or smartphone. These components  include a central processing unit (CPU), memory, input &output ports and secondary storage. Use of SoCs are beneficial as they consume less energy and they require les space.