Okay kiddo, so you know how families have different last names like Smith, Johnson, or Rodriguez, right? Well, in some cultures, people don't use last names like this. Instead, they have something called "gens" which is kind of like a big family group that all have the same name.
So, let's say there's a guy named Tom who is part of the Smith gens. This means that everyone else in the Smith gens is related to him in some way, even if they haven't met before! It's like they're all part of a big family together.
Some gens can be really big, with thousands of people! But even if someone is born into a small gens, they still have a strong sense of connection to their ancestors and the history of their group.
Overall, záh (gens) is a way to organize large groups of people who share a common ancestry and history, kind of like a big family that everyone is a part of.