What do you understand by the term 'Scattering of light'? Which colour of white light is scattered the least and why?

Scattering is the process of absorption and then re-emission of light energy by the dust particles and air molecules present in the atmosphere.

Red colour of white light is scattered the least because wavelength of red light (λ = 8000 Å) is longest and intensity of scattered light (I) ∝ $\frac{1}{λ^4}$.