Whether you have a desktop computer or a laptop, your computer always consists of a CPU. Indeed, a CPU is the part that allows your computer to function properly.
If you have a laptop, the CPU is located inside the computer since you only have one block. In the case of a desktop computer, the CPU will be a block completely separate from the screen, the keyboard and the mouse. Indeed, these will be peripherals of the central unit which will be the heart of the computer. A computer, laptop or desktop, can only work in the presence of the central unit.
A central unit is composed of several elements that are mandatory. These elements are the processor which is a computer chip playing the role of computer brain, the motherboard which is a large circuit board with connection ports and which plays the role of nervous system of the computer, the memory which is also called RAM and which allows the computer to start and store data, the graphics card which is also called video card allows the display of the content on the screen of the computer, the sound card which is also called audio card and which manages the sound of the computer, the hard drive that allows the computer to store the data and keep them even when you turn off your computer and the DVD player which can be a simple player , a single burner or a burner drive allowing you to play DVDs and CDs.
In addition to these elements, other elements are also connected to the central unit. These are called devices. Since the CPU is the centerpiece of a computer, it must be properly protected. Thus, a central unit is protected by a plastic or metal case whose role is to protect the various components of the central unit against electromagnetic waves in addition to acting as sound insulation. The protective case of the CPU is often called the "tower" for a desktop. When you buy a desktop computer, you have the choice between three types of cases namely the big tower case, the middle tower and the mini tower. Whatever type of enclosure you choose, it must be equipped with a power supply.
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