Why dose the sky appears blue while it is transparent?

Why dose the sky appears blue while it is transparent. I can`t put my question the other way around, this is my question. So if there is any one out there who can answer me, please be so kind.
Thank You

Well basically the rays of the sun give off so many colors, that when it meets our atmosphere with oxygen, the two colors that are more visible are violet and blue. And because our eyes are able to see blue more than the UV that's why the sky seems blue. So in fact there are two colors.

I thought the sun reflected off the ocean and makes it blue, because we have so much water on our planet. I don't know if that's right.

The water is blue because of the reflection of the sky. Water is not naturally blue. For instance the water in the ocean appears black at night, and that's because the water reflects off the sky.

Nitrogen in the atmosphere, since the sun's rays bounce of the electrons in the nitrogen at a certain frequency, they appear a bluish color instead of white due to some of the light bouncing off of the atmosphere on it's way down.