Processor Definition - What does Processor mean? A processor is an integrated electronic circuit that performs the calculations that run a computer. A processor performs arithmetical, logical, input/output (I/O) and other basic instructions that are passed from an operating system (OS). Most other processes are dependent on the operations of a processor. The terms processor, CPU and microprocessor are commonly linked. Processor A processor includes an arithmetical logic and control unit (CU), which measures capability in terms of the following: Ability to process instructions at a given time Maximum number of bits/instructions Relative clock speed Most people just say processor instead of "CPU" nowadays. Basically 2 types of processors are availiable in market i.e., followings: 1. Intel:- In Intel there is many varients availiable. Example:-Celeron, Pentium, Core i3, Core i5, Core i7& Core i9.