In the previous video, we discussed one type of energy transfers, namely heat transfers. We said that energy could travel from a hot object to a cold object and that three types of heat transfers exist convection, conduction, and radiation. Another form of energy transfer is work, and there are only Two types of energy transfers heat and work. So if it's not heat, it must be work and vice versa. So in this lecture, we're going to focus primarily on work. So from a physics perspective, what is work?