Binary is a binary language, which means it's made of binary digits: 0 and 1.
You might be wondering, "Why do computers like this?" And that's a valid question.
Computers like binary because it's the only language they understand. It's like they're all, "Hey, human, speak our language or get out."
Want to learn more about binary? Check out Why Don't Computers Understand Us?
Or, if you're feeling brave, try Machine Learn the Binary.
And if all else fails, just ask a binary whiz for help.