Nagaya is a special type of building that was made in Japan a long time ago. It's like a row of houses all stuck together!
Imagine you have a bunch of toy houses and you line them up side by side. That's kind of what a nagaya looks like. But instead of being separate toys, the nagaya were built as one big building that could hold lots of families.
People who lived in nagaya would have their own room, but they would share things like the kitchen, bathroom, and hallway with other families. It's like having your own toy house with your own toys, but you have to share some of the bigger things with other kids in the house.
Nagaya were often built in cities where there was not a lot of space. This way, more people could live in one place without taking up too much room. Today, some nagaya buildings are still around and some families still live in them. It's a special type of architecture that shows you how people used to live a long time ago in Japan.