Webfinger
Encyclopedia
WebFinger is an Internet protocol
Internet Protocol
The Internet Protocol is the principal communications protocol used for relaying datagrams across an internetwork using the Internet Protocol Suite...

 that aims to identify people by their E-mail address
E-mail address
An email address identifies an email box to which email messages are delivered. An example format of an email address is lewis@example.net which is read as lewis at example dot net...

es. It is an extension of the Finger protocol
Finger protocol
In computer networking, the Name/Finger protocol and the Finger user information protocol are simple network protocols for the exchange of human-oriented status and user information.-Name/Finger protocol:...

 used by the unix finger utility to identify users of a particular computer in a network. It could help identify users in a cross-site manner, validate person's identity (by pointing to metadata including public encryption keys), or instead of a phone number in VoIP networks.
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