Okay, so you know how there are these things called books and you can open them up and read the words inside? A CD-ROM is kind of like a book, but instead of words it has a bunch of information stored on it.
You can put the CD-ROM into a special machine called a CD-ROM drive that is built into a computer. It’s like a big mouth that opens up and you put the CD-ROM inside. Then the computer reads the information on the CD-ROM and shows it to you on the screen.
CD-ROMs can have all sorts of things on them like games, music, movies, and software programs. So, it’s kind of like having a bunch of books all in one place that you can access whenever you want.
Sometimes, you might hear people talking about DVD-ROMs, they’re kind of like CD-ROMs but they hold even more information and the pictures and sounds are even better! But that’s a topic for another day.