The most common form of communication with non-physical consciousness has been with people who have passed on, but that is usually referred to as “mediumship” rather than channeling. Channeling usually refers to accessing higher knowledge in order to support spiritual growth and to gain greater clarity about one’s life.
Channeling is a method used to access information from entities that are more evolved and could therefore enlighten us as we move through the evolution of consciousness and back to the Divine.
Everything is in a vibrational state; when a person channels, they are tapping into or plugging into the frequency of which we are all a part of. It’s like tuning in a radio. Each station, or energy plug-in, brings a specific frequency of information that we associate with colors, chakras and tones and specific evolved beings such as spirit guides, angels, archangels, and ascended masters.