Meaning – The CPU or Processing Unit is the brain and heart of the computer, and consists of all the components required by the device to function properly. The main part of the CPU is the motherboard, which features the processor, graphic processor, and other conduits for interfaces such as displays, mouse, printer, keyboard, and other peripherals.
When you buy a computer (desktop), the majority of the price is made up of the CPU, while the external devices are exponentially cheaper.
Since the CPUs today, feature high-performance components, various brands have been investing time and money into providing adequate cooling solutions for the CPU, in order to keep its performance at optimum levels.
If you are an enthusiast, then the first thing you want to do while assembling a custom build PC is to construct the CPU.
Example of usage – “The designer chose a PC for her work, after thoroughly studying the CPU configuration on her various alternatives.”