Emotional Freedom Technique, EFT for short, is also known as tapping and is a psychological form of acupressure. The therapy was developed by Gary Craig. 
EFT is applied by tapping on meridian points. Research by scientists has proved the existence of meridians which they refer to as the primo-vascular system. 
Meridians are a network of energy channels in the body that connect the surface of the body with the internal organs and regions.
Through the flow of energy, meridians bring balance to the body by removing energy blocks and imbalances caused by negative emotions and beliefs.