How is stained glass made? historically, where was stained glass typically used?

Throughout its thousand-year history, the term has been applied almost exclusively to the windows of churches, mosques, and other significant buildings.

Stained glass is still made the same way it was back in the Middle Ages and comes in various forms. For the glass used in leaded glass windows, a lump of the molten glass is caught up at one end of a blow pipe, blown into a cylinder, cut, flattened and cooled.

What is the picture?

Answerto get this answeer, i had to watch the movie: )///(hatchets) is the answer : )