How does the process of heat transfer occur, specifically in relation to how heat goes from hot to cold?

Heat transfer occurs through three main mechanisms: conduction, convection, and radiation. In the context of heat moving from hot to cold, the process primarily involves conduction and convection. Conduction is the transfer of heat through direct contact between materials of different temperatures, where heat flows from the hotter object to the cooler one. Convection, on the other hand, involves the movement of heat through the circulation of fluids or gases, such as air or water, where warmer fluids rise and cooler fluids sink, creating a continuous flow of heat transfer.