You place an empty pan directly on top of a stove burner, and turn on the burner. Soon, the temperature of the pan increases. How is heat transferred from the burner to the pan?
Assuming the ‘burner’ implies you are using gas, then it is predominantly convection.
Pans (or anything else) can heat up by three mechanisms: conduction (primarily solids in good thermal contact) convection (often described as “hot air rises” but applies in any fluid, whether a liquid or a gas) and radiation (shining.)
Whilst there is some contribution from the light (infra-red ‘light’ to be specific) of the gas flame, the vast majority is transferred by the hot gas rising as it expands.