Bot what is heat? What is cold?
Heat is a form of energy that transfers between objects or systems as a result of temperature differences. It is the internal thermal energy of a substance or system. Heat flows from hotter to colder objects in an attempt to reach equilibrium.
Cold, on the other hand, is not a form of energy but rather the absence or reduction of heat. It is the perception or sensation of low temperature. Cold is subjective, as it is a relative term that refers to a decrease in temperature compared to what is considered "warm" or normal for a particular context.