Radiation: 

                            Radiation is the transfer of energy through electromagnetic waves. It's like the sun's rays warming your skin, even though you're not touching it.

Key points:

No medium needed: Radiation can travel through empty space.

Electromagnetic waves: These waves carry energy and can travel at the speed of light.

Different types: There are many types of radiation, including visible light, microwaves, and X-rays.

Real-world examples:

Sunlight: The sun's energy reaches Earth through radiation.

A microwave oven: Microwaves heat food through radiation.

A campfire: You can feel the heat from a campfire even if you're not close to it.

Remember:

                       Radiation is one of the three main ways that heat is transferred. It's important for understanding how things like the sun and microwaves work.