1) s.m.p.s (switch mode power supply)
A switch-mode power supply is an electronic power supply that incorporates a switching regulator to effectively convert electrical power. Like other power supplies, SMPS transfers power from a DC or AC source to DC loads, such as a personal computer, while converting power voltage and current characteristics.
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More details to go shopping web/app to lots of design........
2) Harddrive
A hard drive is the hardware component that stores all of your digital content. Your documents, pictures, music, videos, programs, application preferences, and operating system represent digital content stored on a hard drive. Hard drives can be external or internal.
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3) dvd rom
DVD-ROM stands for Digital Versatile Disk-Read Only Memory.
A read-only DVD is used to store the files permanently which cannot be changed, write-over, or erased.
We can use DVD-ROM for allotment of large applications which increase the size of a CD-ROM disc. The DVD-ROM was introduced through the group of ten international companies in 1996 and developing DVD and HD-DVD formats for media, software, and hardware.
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4) motherboard
The motherboard is a printed circuit board and the foundation of a computer that is the biggest board in a computer chassis. It allocates power and allows communication to and between the CPU, RAM, and all other computer hardware components.
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You can choose motherboard from shopping web / app according to your budget.
If you have a low budget, it is best to buy a motherboard combo pack.
The motherboard combo pack comes with a motherboard, RAM, processor and coiling fan.
5) Cabinet Case
The computer case serves mainly as a way to physically mount and contain all of the actual components inside of a computer, like the motherboard, hard drive, optical drive, floppy disk drive, etc. They typically come bundled with a power supply.
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Note : I do not force to buy the producers that are in all the links given above. Buy the item at your own risk.