Keychain also manages root certificates, keys, and secure notes.
The passwords are dynamically linked to a particular user’s login password, so that when the user logs into a Mac, all of the various accounts and passwords are made available to the operating system and select applications. Keychain can hold passwords for websites, web forms, FTP servers, SSH accounts, network shares, Wi-Fi networks, groupware apps, encrypted disk images and more. With the creation and release of Mac OS X in the early 2000s, Keychain became part of the operating system and was used to hold much more information. The idea was that PowerTalk could communicate with many mail servers and online services, so it would use a keychain file to hold user authentication information within the application to automatically and securely log the user into the variety of services. Keychains were originally developed in the early 1990s for use with an Apple email system called PowerTalk.
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This Tech 101 article explains the functions of Keychain in macOS Sierra as well as how to access and edit Keychain files. Since then, Keychain has expanded to Apple’s mobile devices and synchronizes keychain files between devices through iCloud. Keychain is a password management system for macOS and iOS that was originally released with Mac OS 8.6 back in 1999 as a way of holding passwords, private keys, certificates and secure notes in encrypted files on the machine.
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