A beauty pageant is like a big show where girls and sometimes boys, who are older and look very pretty, dress up and compete against each other to see who is the most beautiful.
The girls go on stage in front of other people and judges and show off their pretty clothes, hairstyles, and even makeup. They may also have to perform a talent like singing or dancing.
The judges then score them based on how well they did and how beautiful they looked. At the end of the show, the girl who gets the highest score is named the winner and may get a prize, like a crown or money.
Winning a beauty pageant can be very exciting for the girl, and it helps her feel confident and proud of herself. However, it's important to remember that looks aren't everything and that everyone is beautiful in their own way.