What is WebFinger?
A way to attach information to an email address, or other online resource.
From the official spec:
For a person, the kinds of information that might be discoverable via WebFinger include a personal profile address, identity service, telephone number, or preferred avatar. For other entities on the Internet, a WebFinger resource might return JRDs containing link relations that enable a client to discover, for example, the that a printer can print in color on A4 paper, the physical location of a server, or other static information.