8 Standard Computer Components and What They Do

Computers are complex machines, with much of the processing and work being done at a microscopic level. But did you know that inside a computer are several parts that you can see or identify with ease? These computer components are what make any machine run and affect its performance.

You don’t have to be an IT expert to learn the basics of what computer parts do and what they look like. Let’s review some of the standard computer components and you’ll hopefully learn something today!


The motherboard is an important computer component because it’s what everything else connects to! The motherboard is a decently sized circuit board that lets other components communicate. A motherboard has ports that face outside a PC’s case, so you can charge your computer, plug in a monitor, or connect a mouse.

A computer’s motherboard also contains slots for expansions, so you can add additional accessory ports if you wish. The motherboard also stores low-level information like the system time even when the computer is turned off.

Power Supply

True to its name, the power supply powers all other components of the machine. It usually plugs into the motherboard to power the other parts. The power supply connects to either an internal battery (on a laptop) or a plug for an outlet (on a desktop).

Central Processing Unit (CPU)

A CPU, sometimes referred to as a computer’s brain, is the workhorse of the machine. It performs the calculations needed by a system, and can vary in speed. The work that a CPU does generates heat, which is why your computer has a fan inside. A more powerful CPU is necessary for intense computer work like editing high-definition video or programming complex software.

Random-access Memory (RAM)

RAM is temporary memory. Whenever you open up a Microsoft Word window, your computer places it in RAM, and when you close the window, that RAM is freed. Since RAM is volatile, its contents are lost if the machine loses power. This is why you lose a Word document when the power goes out if you didn’t save it.

The more RAM you have, the more programs you can run at once. A common cause of slow computers is a lack of sufficient RAM.

Hard Disk Drive / Solid State Drive

Since RAM is temporary, your computer needs a place to store data permanently. That’s where the hard drive comes in. The traditional hard drive consists of several spinning platters with an arm that physically writes data to the disk. However, these drives are slow and are starting to be replaced by the faster solid-state drives.

Solid-state drives consist of flash memory, like your smartphone or flash drive. They are much faster than traditional hard disk drives, though cost more for the increased efficiency. Both types of drives come in various sizes to suit different needs.

Replacing a hard drive with a solid state drive is one of the best computer upgrades you can make — the speed difference is amazing.

Video Card

A video card is a dedicated unit for handling the output of images to a display. Video cards have their own dedicated RAM for performing these functions. A high-end video card is required to process extremely intense visual functions, such as computer drafting by engineers. Like many components, many types of video cards are available with varying power and prices.

An alternative to a video card is integrated graphics, which occurs when the system borrows regular RAM for graphics processing. Typically integrated graphics are attached to the CPU, especially on laptops. Integrated graphics is sufficient for normal computing use and is less expensive than a dedicated card, but won’t work for intense editing jobs or high-end games.

Optical Drives

Though less common than they used to be, many machines still have an optical drive for reading CDs and DVDs. These can be used to listen to music or watch movies, place information onto a blank disc, or install software from a disc. Since most software nowadays is installed from the internet instead of using discs, these aren’t as important as they once were, especially on laptops.

Input and Output Devices

Depending on your particular computer, you can connect a variety of devices to send information into it or out of it. Common input devices include mice (touchpads on laptops), keyboards, and webcams, while output devices consist of monitors, printers, and speakers. Removable media such as flash drives and SD cards can also be used to transfer data between computers.


In summary, here’s the inside of a desktop computer with its parts labeled:

Now you know the basics of what’s inside your PC! These components look slightly different inside laptops to compensate for the size differences, but perform the same functions.

Image credits: Jonathan Zander, Danrok, Evan-Amos, D-Kuru via Wikimedia Commons, GCFLearnFree.org via YouTube

56 thoughts on “8 Standard Computer Components and What They Do

  1. You have provided very useful information about computers. I am very grateful to you. Please tell, I have four memory card slots in my computer whereas my computer has only one of them for memory card , can i put more card in the other three blanks?.

    1. I’m not 100% sure what you’re saying — your computer has four slots for memory cards, but you only have one memory card currently in use on your computer? If that’s the case, then you should be able to put another card in each of the blank slots, yes. Not many computers have four card slots, though, unless you’ve bought USB card readers.

  2. this is really helpful, I’m just starting to learn how to code and I’m going to build a PC. I loved that the explanation for every part is very simple and it was really easy for me to understand what each part does. Thank you!

    1. Charles, I’m afraid I’m not sure what you mean. How would you like to see the software divided?

  3. Thank you very much, to be honest I knew what an SSD is but I never of it’s full abbreviation. Stay blessed for this helpful information to computer students

  4. This lessons helped me, parts of the computer and it’s functions was confusing, but now I got it 100%.

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