Password manager
Software that generates, stores, and fills unique passwords so people do not have to remember or reuse them.
Password reuse is the mechanism behind credential stuffing, and it persists because remembering dozens of unique passwords is genuinely impossible. A manager removes the reason to reuse.
For businesses, the shared-vault capability matters as much as the personal one, because it replaces the spreadsheet of shared credentials and gives you a way to revoke access when someone leaves.
Where this comes up
Password manager sits inside our identity and access work. If you are trying to work out what this means for your own environment rather than in the abstract, that is the page worth reading next, and a short call will get you a straight answer faster than either.