A person who channels is using a guide to speak through, while a medium predicts the past or future (sometimes exeriencing it or seeing it) a "psychic" so to speak, reading people's energy. A Sender is someone who who receives stimuli from an intended target and acts as a transmitter of that information to the Receiver. A Receiver is someone who attempts to perceive by remote viewing and report information about an isolated target. A Receiver is also known as a viewer. (will receive information from the Sender). Hope this helps~