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The Password Compatibility module provides the password checking algorithm for user accounts created with Drupal prior to version 10.1.0. For more information, see the online documentation for the Password Compatibility module.

Drupal 10.1.0 and later use a different algorithm to compute the hashed password. This provides better security against brute-force attacks. The hashed passwords are different from the ones computed with Drupal versions before 10.1.0.

When the Password Compatibility module is installed, a user can log in with a username and password created before Drupal 10.1.0. The first time these credentials are used, a new hash is computed and saved. From then on, the user will be able to log in with the same username and password whether or not this module is installed.

Passwords created before Drupal 10.1.0 will not work unless they are used at least once while this module is installed. Make sure that you can log in before uninstalling this module.