Radiation is the transfer of heat through electromagnetic waves, while conduction is the transfer of heat through direct contact between two objects.
Radiation and conduction both transfer heat from a hotter object to a cooler object, causing the cooler object's temperature to increase.
The rate of heat transfer through radiation is affected by the temperature difference between the objects, the surface area of the objects, and the objects' emissivity. For conduction, the rate is affected by the temperature difference, the thermal conductivity of the materials, and the thickness of the materials.
Radiation is used in everyday life for cooking, heating, and communication technologies such as radios and microwaves. Conduction is used for cooking, heating, and cooling through household appliances such as stoves, ovens, and refrigerators.
Yes, radiation and conduction can occur simultaneously. For example, a pot on a stove can transfer heat through conduction from the stove's burner to the pot, while also transferring heat through radiation to the surrounding air and objects.