what is prothrombin and thrombin

Prothrombin is a glycoprotein present in the blood plasma and takes part in the blood clotting mechanism. When there is any injury clotting factor X or prothrombinase transform the prothrombin into thrombin whose function is to transform fibrinogen into fibrin which in combination with platelets forms a clot.

Please refer the link:
https://www.meritnation.com/ask-answer/question/is-thrombin-a-protein-or-an-enzyme-and-if-thrombin-is-an-enz/body-fluids-and-circulation/8809213