Single Sign-on
When you login to your device with your username, password and yubikey, you will have instant access to the apps that appear in your Dashboard. This means you won’t need to login again to these specific apps with a username and password.
In the future, everyone will be able to access all their apps just by logging into their device and will not need to individually sign-on to specific apps.
This is because your identity has already been verified by logging in with your username, password and Yubikey!
Multi-factor Authentication
However, some of the apps we use today aren't in your Dashboard, you will need to login with an individual username and password after logging in to your device.
However, to make it easier you will login to these apps using your Password Manager (Dashlane). Dashlane will save your passwords for you so you don't have to remember them! It will also automatically enter your username and password for you! Accounts that are not 'single sign on' might still ask you for another form of authentication such as an SMS or code from an App such as Google Authenticator.
This more secure and more convenient then writing any of your usernames or passwords down.