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The scattering of blue component of the white sunlight by air molecules present in the atmosphere causes the blue colour of the sky.The sunlight Is made up of seven coloured lights mixed together. When sunlight passes through the atmosphere, longer wavelength lights present in it do not get scattered and they pass straight but blue is of shorter wavelength so it scattered all around the sky . So wherever you see some of blue light enters our eyes.
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As the light from the sun travels through the atmosphere, it gets scattered in different direction by the air molecules present in its path. The blue(or violet) light due to its short wavelength is scattered more as compared to the red light of long wavelength. Thus light reaching our eye directly from the sun is rich in red colour while the light reaching our eye from all other direction of sun is the scattered blue light. Therefore the sky in direction other than the direction of sun is seen blue. 
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