Master Password is a different way of using passwords. Instead of the "know one password, save all others somewhere" way of managing passwords used by regular password managers, Master Password's motto is "know one password, generate all the others".
From the moment people started using passwords, it didn’t take long to realize how many people picked the very same passwords over and over. Even the way people misspell words is consistent. In fact, people are so predictable that most hackers make use of lists of common passwords just like these. To give you some insight into how predictable humans are, the following is a list of the 500 most common passwords.