I have a lot of passwords for my computer to access various sites that we receive advertising and e-mail from.
I’ve been able to memorize a great many of them, but for my memory’s sake, and for other people to use at some future time, I have them stored safely away.
Some are as simple as a four-digit number much like you have for your bank access card. Others combine numbers, the alphabet, and keyboard characters.
Some are as many as 16 digits long for added security.