Conduction : The heat transfer due to conduction takes place if the two bodies at different temperatures are in contact with each other. It is also true if a substance is heated from one end. heat transfer takes place to the other end by conduction.
Convection : When liquid or gas is heated, expansion takes place. Due to this it becomes lighter and rises up. Its place is taken by colder or dense fluid. This is a continuous process and thus heat transfer takes place due to these currents and heat is distributed through the mass.
Radiation : The heat transfer due to radiation takes place from one body to another without effecting the medium through which heat travels. Heat flow from sun to earth takes place in this fashion.
Sensible Heat : It is defined as the amount of heat required to raise the temperature of 1kg of substance from 0 C to the desired temperature without changing its state.
Latent Heat : Latent heat of a substance varies from its sensible heat as it does not cause any temperature variation within the body but changes its state i.e.., from solid to liquid or liquid to gas.
Example : 80 Kcal of heat is absorbed from the surroundings when 1kg of ice changes into water at a constant temperature 0 C to freeze it to ice at the same temperature.