Blood clots are gel-like clusters of blood that occur as blood shifts from liquid to partially solid in your arteries and veins. Clotting is a natural body process that prevents your body from bleeding excessively when you are injured. Blood clots are divided into two varieties. Clots that stay put and don’t move (thrombosis) and those that break away from where they formed and travel to different parts of your body (thrombosis) (embolism). A blood clot can be fatal depending on what it blocks or where it moves. A blood clot is a clump of blood that has changed from a liquid to a gel-like or semisolid state. Clotting is a necessary process that can prevent you from losing too much blood in certain instances, such as when you’re injured or cut. When a clot forms inside one of your veins, it won’t always dissolve on its own. This can be a very dangerous and even life-threatening situation.