Activity Pub is a decentralised social network protocol based on Activity Streams format.
In the most basic sense, ActivityPub specifies how different actors can communicate with each other.
This means there are messages, inboxes and outboxes to store them, and activities to receive and send them - respectively.
The vocabulary for these is specified by ActivityStreams.
The ActivityPub standards document has a good overview of what the protocol is and how it is used.
This project aims to implement a very basic version of the above. It mainly revolves around manipulating class objects. Thus this is mainly a learning exercise to get more familiar with Java.