I love when I am asked this question.
I read people solely through email now. I used to read them in person, on the phone or via Skype but email is my fav.
So, how can we read you? Even email readings? It is all based on energy. We all have energy systems – chakras, an aura, a spirit/soul, guides, etc. and psychics (legit ones) sense and read your energy, communicate with your spirit, guides, etc. and use this map of information to bring you a great inspiring useful reading.
In short – we are all made up of energy (otherwise we would be dead) and psychics, intuitives, etc. can sense this energy and read it to provide you insight.