COVID 19 is a disease that has affected the whole world. Research to find a curative treatment for this disease is still ongoing. For this purpose, understanding the disease well and accurately is the most important resource. This book includes information about COVID 19 compiled from a microbiological, biophysical, physiological and therapeutic perspective. Additionally, the mechanisms of the disease at the molecular level are also discussed. We hope that this information collected will shed light on the studies to be carried out.