Receivers accept inbound messages into HL7 Soup. If you accept the defaults, you will have created a receiver that accepts HL7 messages via TCP on port 22222
Inbound messages can also trigger the execution of workflows that you have written. These can transform data, then write it to a database, send it to another system, or import it into another application.
If you would like to see a video on how to create Receivers then I suggest you look a this video, which goes into detail on this topic.