Computer components

what is a hard drive

A hard disk drive (sometimes abbreviated as Hard drive, HD, or HDD) is a non-volatile memory hardware device that permanently stores and retrieves information. There are many variations, but their sizes are generally 3.5" and 2.5" for desktop and laptop computers respectively. A hard drive consists of one or more platters to which data is written using a magnetic head, all inside of an air-sealed casing. internal hard disks reside in a drive bay, connect to the motherboard using an ATA, SATA SCSI, or SATA cable, and are powered by a connection to the PSU (power supply unit).
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what is a CPU

The CPU (Central Processing Unit) is the part of a computer system that is commonly referred to as the "brains" of a computer. The CPU is also known as the processor or microprocessor.

The CPU is responsible for executing a sequence of stored instructions called a program. This program will take inputs from an input device, process the input in some way and output the results to an output device.

CPUs aren’t only found in desktop or laptop computers, many electronic devices now rely on them for their operation. Mobile phones, DVD players and washing machines are examples of equipment that have a CPU.

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Monitor

In computers, a monitor is a computer display and related parts packaged in a physical unit that is separate from other parts of the computer. Notebook computers don't have monitors because all the display and related parts are integrated into the same physical unit with the rest of the computer. Monitors are very similar to televisions but usually display information at a much higher resolution.
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Optical Drive

The optical drive normally goes by other names like disc drive, ODD (abbreviation), CD drive, DVD drive, or BD drive.An optical drive is a piece of computer hardware is about the size of a thick cover on a book. The front of the drive has a small Open Close button that ejects and retracts the drive bay door. This is how media like CDs, DVDs, and BDs are inserted into and removed from the drive.
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Motherboards

The motherboard serves to connect all of the parts of a computer together. The CPU, memory, hard drives , opptical optical drives, video card, sound card and other ports and expansion cards all connect to the motherboard directly or via cables.