An example of heat transfer that is not convection or radiation is conduction. Conduction is the transfer of heat through direct contact between materials. When two objects at different temperatures come into contact, heat energy flows from the hotter object to the colder object through molecular interactions.
For instance, if you touch a hot metal spoon, heat is conducted from the spoon to your hand. The heat energy is transferred through the metal molecules of the spoon, which collide with the molecules in your hand, causing them to gain energy and increase in temperature.
Conduction is a prevalent mode of heat transfer in solids, where molecules are closely packed together and can easily transfer energy. It also occurs to some extent in liquids and gases, but to a lesser degree due to the greater mobility and larger intermolecular spacing of molecules in these states.
In summary, conduction is the transfer of heat through direct contact between materials, while convection involves the transfer of heat through the movement of fluids, and radiation refers to the transfer of heat through electromagnetic waves.