In every textbook I read, it says that heat is a form/type of energy... but in lecture, my professor said, that there is no such energy as heat and that heat is just a method by which we can transport energy to another system. Do these 2 statements say the same and I'm just reinterpreting the first one badly. If I were to say in my own words what heat is just based on the textbook's definition, I'd say that heat is energy, that... But if I were to say it by the lecturer words, I'd say that heat is a disordered transfer of energy, not energy itself. What's more correct?