Final answer:
Radiation is the transfer of heat through electromagnetic waves without the need for molecular contact. It enables heat to travel across distances, even in a vacuum, and is experienced when we absorb heat from sources like the Sun or a fire.
Step-by-step explanation:
The exchange of heat energy through electromagnetic waves that does not require molecular contact is known as radiation. This phenomenon allows heat transfer to occur over a distance, even through the vacuum of space, as is the case with the heat from the Sun reaching Earth. Different types of electromagnetic waves such as infrared radiation, visible light, ultraviolet radiation, and others can all carry thermal energy. For example, when you feel the warmth from the Sun or a fire without making physical contact, you're experiencing heat transfer by radiation. Another example is the warmth you feel from an oven without touching it; the heat is radiated and absorbed by your skin.