While they often go by different names, antifreeze and engine coolant are the same thing. They should really be called �engine regulant� or something official-sounding like that because their job is twofold: to stop engines getting too hot in the summer, and to stop them getting too cold in the winter. You�ll often hear of high-tech things being �liquid cooled� � which sounds super fancy but is actually just a case of pumping water-based coolant through pipes in order to warm the water up and take that heat away from the thing you want to cool. Now, water�s great at taking on heat and giving heat off, but it also has some undesirable properties when it comes to cooling mechanics. Namely, it freezes in low temperatures, boils at a relatively low temperature, and often speeds rust & corrosion in mechanical parts. To this end, various antifreezes have been formulated to try to combat these problems with different aims and different levels of success.