Good passwords are messy. They’re long, chaotic, and very difficult to memorize. That’s what makes them so strong. To keep them good and useful, though, requires a tool — a password manager.
The idea at the core of most password managers is simple: A database that matches user names and passwords to login pages is stored under the protection of a single strong password. When a login page is encountered, the password manager springs into action, filling in the necessary fields when unlocked with the master password.