What the hell is Netflix?

If this is a serious question, then I'll explain. Its a DVD rental-by-mail service. After signing up for their service, you go onto their website and list all the movies you'd like to rent. They send out the movie at the top of your list, and when you're done, you send it back to them. When the receive that, they send out the next movie in your queue, and so on. You can sign up for a 2-movie plan, which costs a little more.
Instead of late fees, you have your monthly subscription fee. You're free to keep your movies as long as you want, but there's more than a few people who choose to rip and copy the movies as soon as they get them (which there's no real way for them to dissuade you from doing).
Gamefly works the same way, but for video games (and its a little more expensive, but still a great service.)
Their service has Blockbuster shitting their pants. They've tried to offer a similar service, but its been nothing but trouble for them.