Why are we not able to see the stars during the day time?
Because of the brightness of sunlight
Stars are present in the sky during the daytime too, but they are not visible due to the scattering of sunlight. Sun is the closest star to us. In our sky, there are many stars bigger than the Sun but situated very far from us. Since blue light scatters the most in the atmosphere, the sky appears blue and all the stars are veiled behind.