A password manager is a software in which you can store all your passwords. It basically stores all your data in some file or database, and keeps that encrypted. All the passwords can be accessed be one single master password. This ensures that you just need to remember one password, and using that you can access all your passwords.
Here is a free Blockchain based secure password manager. Use it to save your confidential passwords and notes on a decentralized database. Use it as a Nebulas wallet as well.→