ELI5: Explain Like I'm 5

Second unit

Okay, so you know how sometimes we have two or more things that do the same thing but we only need one of them at a time? Like two toy cars or two pairs of shoes?

Well, for some houses or apartments, there is something called a second unit. It's like having two houses in one building!

The main house is where the family live and do things like sleep, eat, and play. The second unit is a smaller house that has its own kitchen, bathroom, and sometimes even its own entrance. It's kind of like having a mini-house inside the bigger house.

Sometimes the people who live in the main house rent out the second unit to someone else. That means that another family, or sometimes just one person, can live in the second unit and have their own place to sleep, eat, and do their own things.

It's a good way for families to make extra money by renting out part of their house, and for other people to find a place to live without having to pay for a whole house or apartment all by themselves.