Google Chrome can save your usernames and passwords for different websites. When you save a username and password, Chrome can then automatically complete the sign-in fields for you the next time you visit these websites.
These passwords are stored in the same system that contains your saved passwords from other browsers. On a Mac, Google Chrome uses the Keychain Access to store your login information.
All these passwords – including the passwords you've saved from other browsers – can be synced to your Google Account, so that they are available on other computers you're using.