A Password Strength Checker is a tool that analyzes the strength of a password to determine its level of security. It evaluates a password based on factors such as length, complexity, and randomness to calculate the likelihood of the password being guessed or hacked.

Password Strength Checker tools typically provide a rating or score for the password, indicating its strength level. The rating may be displayed as a color-coded system, such as green for strong, yellow for moderate, and red for weak passwords. Some tools may also provide suggestions for improving the password's strength, such as adding numbers, special characters, or uppercase letters.

Password Strength Checker tools are important because weak passwords can leave user accounts vulnerable to hacking, identity theft, and other cyber attacks. By using a password strength checker, users can assess the security of their passwords and make improvements to ensure their accounts remain secure.