Overview#Password Reuse is the concept from that is recommended by information security experts have using a unique password for every individual site on which Traditional Registration is required.
Password Reuse is part of the Password-composition Policy
With an average of 130 accounts registered to one Email Address in the United States, it's not surprising that 73% of users have duplicate passwords. Expecting a User to remember 130 different passwords would be extremely difficult for anyone — and probably send Password Recovery requests through the roof.
More Information#There might be more information for this subject on one of the following:
- Password Authentication
- Password Authentication is Broken
- Password Management
- Password Statistics
- Passwordless SMS Authentication
- Traditional Registration
- [#1] - Is Passwordless Authentication More Secure Than Passwords? - based on information obtained 2019-10-14