What is iCloud Keychain?

>>> iCloud Keychain remembers things for you: website and app passwords, Wi–Fi login details, online account logins, and credit and debit card details. It stores all of that data securely so that other people can’t access it, and it makes everything available across your devices, so for example you can log in to a Wi–Fi network on your Mac that you’ve previously connected to with your iPhone. You just need to prove that you’re you using your face, fingerprint, or iCloud password. You have to enable two–factor authentication to use iCloud Keychain on any device running iOS 13 or macOS Catalina or later. That’s important because you don’t want the info iCloud Keychain stores to fall into the wrong hands.