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Webmention Explained: How Websites Notify Each Other When They Are Linked
Webmention is a W3C Recommendation that lets one web page notify another that it has linked to it. It provides a standard machine-to-machine version of the old blogging practice of sending a pingback or trackback when a site references another page.
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What Is NodeInfo? The Metadata Standard Used by Fediverse Servers
NodeInfo is a small metadata protocol used by many decentralised social servers to publish information about the software they run and the community they host. It can expose details such as the server software and version, supported protocols, usage counts and whether registrations are open.
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What Is WebFinger? How ActivityPub Finds Accounts Across the Fediverse
WebFinger is a discovery protocol that lets software ask a domain where information about an account or other resource can be found. In the Fediverse, it is commonly the step that turns an address such as @alice@example.social into the ActivityPub actor URL that another server can fetch.