Worker
A Worker, also known as an Application Node, is a single process with an instance of Resonate. An application can have between 1 and n unique Workers.
Group
A Group is a set of Workers that share a Group ID.
Workers in a Group should be identical instances of each other. That is — a Group of Workers are processes with identical code bases.
An application can have between 1 and n unique Groups.
Fleet
A Fleet is the application’s full set of Workers and Groups.
A Fleet can have a between 1 and n unique Workers and 1 and n unique Groups.