Binary numbers are extremely important to computers and technology. You see, a computer only understands electrical impulses. There either is a charge, or there isn’t. It’s either “on” or “off”, 1 or 0 in mathematical terms.
This is called “Binary”. Here’s a short video on Binary.
He does a good job of explaining this. The computer uses these binary numbers to translate everything into something it can understand. You might occasionally hear the phrase “It’s just ones and zeros” in reference to a computer file. Binary is where this comes from.