DrawBridge is a two part service. A Google chrome extension catches login forms for any given website and prompts a user for a phone number to request authentication from. This pings the mobile user via APN (Apple Push Notifications) and gives him or her the option to authenticate the forms using his encrypted passwords on his or her device, than send back a valid session cookie allowing the desktop user access to the requested site. The mobile user decrypts his locally stored passwords using TouchID.
This created another barrier of security as your username and password are never actually passed through the network that you login with. In addition to that it give you the ability to a log a friend or colleague into one of your services remotely without ever giving them your password.