Everything in the universe, including humans is energy. Energy is all around us. Everything our senses perceive is energy as well as everything our senses do not perceive.
Energy vibrates at different frequencies. There are low frequencies, high frequencies and frequencies that range between the two. Low frequencies vibrate slow and high frequencies vibrate fast. Low frequencies are associated with disharmony in the body and higher frequencies are associated with a state of well-being. For instance, emotionally, low frequencies are associated with hatred, fear, worry, pessimism and doubt.