In simple terms frosted glass are glass that are either partially or completely opaque. Previously the only option for making frosted glass were sticker normal transparent glass. But now with the evolving solutions in the field of glass for modern architecture provides a wide range of options for frosted glass. The professional terms used for a glass that is manufacture with these opaque features go by the name Sandblast or Acid Itched.
It is a known fact that glass let brightness and light pass through them. But sometime too much light is not really pleasing. For instance, if your home is situated in such a way that you do not have any tree shadows or buildings to partially cover block the sunshine, this could literally lead to a high temperature within the building affecting the cooling system and consuming more energy to keep the room even at a stable range. And this will not only be the case, the strong rays of sunshine could also lead to fading away of carpeting and wooden flooring color when exposed for a very large time frame.
This is when a frosted glass windows comes in handy. A frosted glass window may not give you and 100% solid “no light through policy” but they can provide you an obstruct certain level of lighting passing through them, which will be a solution for the “too much light” issue.