Gender is a way for people to think about themselves and the things they like and how they want to express themselves. Imagine every person has a special box inside them that helps them understand who they are. This special box is like a combination of how they feel inside and the outside things like clothes, toys, and activities that make them happy. Some people feel like they have a boy box, and they like things like cars, superheroes, and the color blue. These people might think of themselves as boys. Other people feel like they have a girl box, and they like things like dolls, princesses, and the color pink. These people might think of themselves as girls. But some people don't feel like they have just a boy box or just a girl box. They might feel like a mix of both boy and girl things, or they might feel like they don't have a box at all. These are people who are non-binary or may use other words to describe their gender.
It's important to remember that everyone's special box is unique, and they can like all sorts of different things no matter if they are a boy, girl, or non-binary. Some boys might like pink or dolls, and some girls might like cars or superheroes. It's okay for everyone's box to be different!
It's also important to remember that people might not always look like the things they like or how they feel inside. Some boys might like to wear dresses, and some girls might like to have short hair, and that's okay too! What matters most is that each person's special box helps them feel happy and comfortable with who they are.
So, in simple words, gender is like a special box inside each person that helps them understand who they are and what makes them happy, whether they feel like a boy, a girl, both, or neither.
I hope this helps you understand what gender is all about!