If the user has multiple devices – such as smartphones, tablets and/or other Macs – then the system will enable iCloud Keychain, Apple's cloud-based password management service. Since it is part of the operating system, the only thing Mac owners need to do is use the computer so long as autofill is enabled – which it is by default.
Every Mac includes a password manager service built into macOS by the name of Keychain Access, an app that stores your password and account information, and helps you to reduce the number of passwords that you have to remember when using Apple's default web browser, Safari.