The password strength checker is one of the easiest ways to make sure that your passwords are strong. It's a free online tool that lets you test how long it would take an attacker to guess your password with a given number of tries. There are two types of password strength checkers: those that can estimate your password quality by looking at factors like length and complexity, and those that simply tell you whether your password meets minimum requirements for strength. There's no right answer here, but if you're concerned about the security of your passwords, it's worth testing both to see which type works best for you.