Feeds are a tool for consuming Edlink platform events (e.g. person login, integration creation, materialization failure). This allows you to create workflows around and respond to actions taken on the Edlink platform programatically. No need to meticulously check the dashboard!
You can think of each Application in Edlink as a default feed that you can create subscribers for. These subscribers are resposible for deciding which events are observed and how they are consumed. This means that while there is one source of events, there can be many subscribers that consume them in different ways for different purposes.