What are the 3 internal components of a computer?

Many things are inside the case of a computer, and some will just depend on your computer, but the hardware all computers have are:

The CPU, or central processing unit: This is often called the "brain" of your computer, for it is what makes all the other pieces of the computer do whatever you want it to do. It is one of the most expensive and important parts of a computer.

The CPU cooler: This piece cools down your CPU, since it gets very hot from the work it is given.

The motherboard: this is where all of the components of a computer are connected to. It transfers what the CPU wants something to do to that certain piece to execute the task. It would probably be something like the body in general or the nervous system in a human.

The RAM, or random access memory: This is where all your processes are stored. It is like the short term memory in humans, while you are using it, you remember it, but once you delete it, it is gone from your memory.

The power supply: To put it simply, it is what supplies the power for your computer. All it does is convert the unusable electricity from your home wall socket into a usable form of electricity and spreads it throughout your computer.

The next pieces are not necessary, but are in most computers:

The hard drive: This is the long term memory, where your files are saved onto, unless you delete it. All of your downloads, programs, files, documents, etc. are saved onto here.

The graphics card: Commonly mistaken as the GPU, or graphics processing unit, is what creates the images that you see on your monitor. It converts the code given to it from the CPU into the pictures that you see on your screen today. The GPU, is simply a part of the graphics card, the part that does most of the converting.

The optical drive: This is the cd/dvd/blu-ray player in your computer.

Now, for the optional items:

A sound card: Most motherboards these days have integrated sound built in to them, but if you are an audiophile or need very high quality music for some other reason, you will need a sound card. Most computers do not usually come with one, however.

Fans: To cool down your system and increase air flow.