Raise your hand if you've ever read a README file. Now, keep that hand raised if you've ever written a README file. I'm going to take a shot in the dark and assume that your hand is still raised; at least, it's raised in spirit, since you probably refuse to flail your arms about like a crazy person just because I tell you to. After code comments, the README file is one of the most ubiquitous forms of documentation found in software development today. While not every source code repository has a README, it's a good bet that every successful one does.