The sky appears blue to us because of the way Earth's atmosphere scatters sunlight. When the sun's light reaches the Earth's atmosphere, it is scattered in all directions by the gases and particles in the air. Blue light is scattered more than other colors because it travels as shorter, smaller waves. This is known as Rayleigh scattering.

As a result, when we look up at the sky during the daytime, we see more of the blue light scattered towards us than the other colors. This is also why sunrises and sunsets often appear to have reddish or orange hues, as during those times, the sunlight has to travel a longer distance through the Earth's atmosphere, and more of the blue light has already been scattered away, leaving behind more of the reds and oranges.
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