Fediverse

The fediverse (often referred to as just fedi^{[citation needed]}) is a collection of social networking services that can communicate with each other (formally known as federation) using a common protocol. Users of different websites can send and receive status updates, multimedia files and other data across the network. The term fediverse is a portmanteau of "federation" and "universe".^[1]

The majority of fediverse platforms that are available are free and open-source software, and are based on the ActivityPub protocol. However, alternative protocols such as AT Protocol and Nostr have formed their own networks separate from ActivityPub.^[2]