The three types of heat transfer are:
Conduction: Conduction is the transfer of heat between two objects that are in direct contact with each other. Heat is transferred from the warmer object to the cooler object through molecular collisions.
Convection: Convection is the transfer of heat through the movement of fluids (liquids or gases). Heat is transferred through the motion of molecules within the fluid. Examples of convection include the heating of a room by a radiator and the movement of air in the atmosphere.
Radiation: Radiation is the transfer of heat through electromagnetic waves. Unlike conduction and convection, radiation can transfer heat through a vacuum, such as in space. Examples of radiation include the heat we feel from the sun and the warmth from a fire.