Cathode-ray tube

A cathode-ray tube (CRT) is a special kind of television or computer screen. It's kind of like the screen on your tablet or phone, but it looks different and works differently too.

The CRT has a big glass tube that is shaped like a big round TV screen. The tube is filled with gas, kind of like the air we breathe. But the air inside the tube is different. It is a special kind of gas that can make colors and light up when electricity passes through it.

At the back of the CRT, there is a special part called the "cathode". This is where the electricity comes from. When the electricity moves through the cathode and into the tube, it makes a bunch of tiny dots on the screen light up. These dots are called "pixels".

The pixels can make different colors, depending on how they light up. There are three colors that can be made: red, green, and blue. When these three colors are combined, they can make all of the other colors that we see on the screen.

So, when you watch a video or play a game on a cathode-ray tube screen, you are really just watching a bunch of pixels light up in different colors. It's kind of like a big, fancy coloring book that moves and changes really fast!