Sunlight is made up of seven visible colours that combine to form white light. Most people see sunlight as plain white or yellowish light, but in reality, it contains a full spectrum of colours. These colours become clearly visible when sunlight passes through a prism or appears naturally in a rainbow after rain.

The seven colours found in sunlight are: **Violet, Indigo, Blue, Green, Yellow, Orange, and Red** — often remembered by the acronym **VIBGYOR**. Each of these colours has a different wavelength and energy level. Violet has the shortest wavelength and highest energy, while red has the longest wavelength and lowest energy.

The process that separates these colours is called **dispersion**. When light passes through a prism or droplets of water in the air (like in a rainbow), it bends and splits into these seven different colours. This is because each colour bends at a slightly different angle due to its unique wavelength.

Let’s look at the other options:
- **Three colours** is incorrect — RGB (Red, Green, Blue) is related to light mixing in screens, not sunlight composition.
- **Six colours** and **eight colours** are also incorrect, as the scientifically accepted number of visible spectrum colours in sunlight is seven.

In conclusion, sunlight may look simple, but it holds a beautiful and scientifically rich spectrum of **seven colours** that together create the light we see every day. This discovery not only helped us understand light better but also led to advancements in optics, photography, and even communication technology.