Password strength is important because it measures the effectiveness of a password against possible guessing or brute-force attacks. Primarily, it gives you an estimate on how many
tries an attacker who does not have any idea to the password would need, to guess your password correctly. The strength of a password is normally based on its length, varying
characters used, and unpredictability.
Having strong passwords can help lower your risk of a security crack or breach. The speed at which an attacker can submit the guessed passwords to the system is also an important
factor in determining system security. Some of which would inflict a time-out of several seconds after a few failed password entry attempts. In the absence of other possible
attacks, systems can be secured with fairly simple passwords. However, the system must keep information about the user passwords in some form, and if that information is stolen by
breaching, then the user passwords can be at risk.