Without a doubt, there are also those consumers who know their credit card numbers by heart (makes online shopping and booking travel so much easier, if anything). But how many of you know what those numbers really mean? Contrary to what you may think, they aren’t random. Those 16 digits are there for a reason and, knowing a few simple rules, you could actually learn a lot about a credit card just from its number. This infographic shows you how to crack that code.