Glass. You see it when you look out your windows, but what is the technology of glass? The technology of glass is that it is hard and clear. These things make glass a very popular material to make windows out of. They solve a  problem as well ,when it is really stormy outside and you want to make sure that trees are not going to fall on your house you can look through a window and still be warm inside your house and you do not need to get wet in the storm. Glass in windows is specifically clear so you can look outside but solid and strong so wind or rain does not get into your house.