The sun emits radiation across the electromagnetic spectrum, but the three main types that reach Earth are:

1. Ultraviolet (UV) radiation: This is the highest energy radiation from the sun, responsible for sunburns and skin cancer. It's further divided into UVA, UVB, and UVC, with UVB being the most harmful.

2. Visible light: This is the range of radiation we can see with our eyes, making up the colors of the rainbow. It provides energy for photosynthesis in plants.

3. Infrared (IR) radiation: This is lower energy radiation than visible light, felt as heat. It's responsible for warming the Earth's surface.