If the check box is selected, Kaspersky Security Cloud checks the strength of a password that you are entering in the browser for the first time, and notifies you about it.
If the check box is selected and you are entering or creating a password, Kaspersky Security Cloud checks whether you have previously used the password on the websites of banks, social networks, or mail services.
Clicking this link opens the Website categories window. In this window, you can select the website categories for which the use of the same passwords should be monitored.