At its core, password security is about protecting user accounts from unauthorized access. This is achieved through the use of passwords, which are essentially secrets shared between the user and the service provider. The strength of a password is a critical factor in its effectiveness as a security measure. A strong password is one that is difficult for others to guess but easy for the user to remember. However, human memory has its limits, and the number of passwords an average user has to remember is often too high, leading to the widespread practice of password reuse or the use of weak passwords.