People say 'thank you' to show they are grateful. It lets others know we appreciate what they did, and it helps us get along better with them.

Saying 'thank you' is part of being polite. It's something we do in many cultures to keep things friendly and nice when we talk to others.

When we say 'thank you,' it makes everyone feel good. It can make people want to be nice again and helps create a happy mood.

I feel good when someone thanks me. I remember once when a simple 'thank you' really made my day better. I try to teach my kids to say it too.