There are shirts that say “There are 10 kinds of people in the world. Those that know binary and those that don’t.” Now you’re somewhere in the middle!
If you’re confused, you’re (apparently) not alone. On that note, here are two additions:
Think of the 1′s and 0′s as symbols separate from numbers. 1 means the correlating digit is used while 0′s mean it isn’t. Maybe think of it as a light switch. 1 is on and 0 is off.
Here’s an additional graphical depiction in case the text description of the format was confusing. Click here.