Blood clots or thrombi are formed by the reaction of platelets and the inner part of the artery wall, but they can also occur inside the heart, veins and capillaries. They are a key part of the two most important processes in the human body, hemostasis and thrombosis. Hemostasis is a normal physiological process whose goal is to stop bleeding and keep the body alive after satisfying the following. It takes place on a damaged blood vessel where it is necessary to quickly stop the loss of large amounts of blood. In addition to the formation of a blood clot, other mechanisms for maintaining hemostasis are constriction of blood vessels, formation of a platelet plug, and ingrowth of connective tissue. Thrombosis is a pathological process that involves the formation of blood clots in an undamaged vessel or a vessel with relatively little damage. The formation or travel of blood clots can cause a variety of diseases and conditions such as atherosclerosis, sickle cell anemia, femoral vein thrombosis, massive pulmonary embolism.