An Ingest (sometimes referred to as an Ingress) is where we receive your audio stream. We have a number of servers that handle all the incoming connections from our clients. When you set up your encoder with the stream details we provide you, you're directing your stream to a port on our ingest server.
This stream is distributed to your listeners via multiple edge servers, which are load-balanced (i.e. the servers work together to handle hundreds of listener connections) for extra stability, security and reliability.
You can monitor your Ingress feed in your Portal account (located in your stream page under Stream Information).