Langstroth Bee Hives

The Langstroth bee hive design is very interesting. I was not aware that there were different styles and types of bee hives! Things I found interesting was that there is a brood chamber where the queen lays her eggs. Second is that bees organize there hives and store the honey above the eggs. Last I thought it was interesting how bee hives come in different sizes and depths. One thing I will look for next time I am out in the garden/apiary is to look for what size and depth our bee hives are. One question I have is what is a brood chamber?