At the same time, or at your later pleasure, you begin building a list of movies you'd like to rent, choosing from categories such as actor, director, genre, studio. Your growing wish list remains in the NetFlix computer. Now for the truly cool spin. There is no return date for any disc you rent. When you're ready to return a disc, you just pop it back into the envelope in which you received it and drop it in the mail.
Postage is prepaid.
When your returned disc is received at NetFlix, the computer automatically kicks out the next movie on your wish list. And so on. You're continually charged at your membership rate, and you use your membership at your own pace. Keep a movie three months if you like, or keep sending them back every couple of days. The turnaround time for getting another movie is about a week.