An ethnic group is a group of people who share common traits like language, culture, traditions, and ancestry. Imagine you have a bunch of friends who all speak the same language, eat the same kinds of food, and celebrate the same holidays - that's kind of like an ethnic group!
But sometimes, people in different ethnic groups might look different from each other, too. For example, if you have a friend who has really dark skin and another friend who has really light skin, they might be part of different ethnic groups.
It's important to remember that everyone's experiences and backgrounds are unique, even if they're part of the same ethnic group. And no matter what your ethnic background is, everyone deserves to be treated with kindness and respect.