Apple's iCloud keychain is a password manager for macOS and iOS devices including Macs, iPhones, and iPads. Username/password pairs, credit card information, Wi-Fi credentials, and other personal data can be stored in iCloud, and shared amongst all of your Apple devices. Your personal data are encrypted with 256-bit AES, and saved in your iCloud, and transferred to and from iCloud to your devices encrypted so it is very secure. The data stored in your keychain can be accessed through Safari, and some third-party Apple apps but not with Google Chrome, unfortunately.

2FA (2-factor authentication) is a form of MFA where a user is required to supply 2 forms of authentication to allow access to the system. The traditional authentication system used the username/password pair to grant access to an account, but a growing number of hacking due to the use of weak passwords prompts the industry to offer an additional form of authentication to enhance the security of login access.

Web browsers today offer a built-in password manager, and auto-populate username and password on the websites you visit. This is a very convenient feature offered by virtually all web browser makers including Google Chrome, Safari, Firefox, and Microsoft Edge. The question is whether you can trust browser password managers to store your passwords without a security risk.

Multi-factor authentication also commonly known as MFA is an authentication process where more than one authentication mechanism is incorporated. A common implementation of MFA is the 2FA, which stands for 2-factor authentication. In a 2FA, two different authentication mechanisms are combined to successfully authenticate a user.