Most of the light in the daytime sky is caused by scattering, which is dominated by a small-particle limit called Rayleigh
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| Couple under blue sky, by Samuel Hull |
The scattering due to molecule-sized particles (as in air) is greater in the directions both toward and away from the source of light than it is in directions perpendicular to the incident path. Scattering is significant for light at all visible wavelengths, but is stronger at the shorter (bluer) end of the visible spectrum, meaning that the scattered light is bluer than its source: the Sun.
The remaining sunlight, having lost some of its shorter-wavelength components, appears slightly less blue. The sky can turn a multitude of colors such as red, orange, purple, and yellow (especially near sunset or sunrise) when the light must travel a much longer path (or optical depth) through the atmosphere.
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