Trooping the Colour is a big fancy parade that happens every year in England. It's like a really big birthday party for the Queen!
Here's how it works:
First, hundreds of soldiers who work for the Queen's army get all dressed up in their fanciest uniforms. They wear bright red coats and tall, furry hats called bearskins.
Then, they line up in rows and march through the streets to a big field where the parade happens.
There's lots of music and drumming and everybody cheers.
Eventually, the Queen herself comes out and watches the parade. When the soldiers get close to her, they do this really cool thing called "trooping the colour."
What that means is they hold up a big flag called a "colour" and march it in front of the Queen. The colour is really heavy so it takes a lot of strength and teamwork to carry it.
It's a big honor to carry the colour and the Queen picks a different group of soldiers each year to do it.
After the soldiers finish trooping the colour, there's more music and the Queen goes back to her palace.
It's a really special day because everybody comes together to celebrate and show how much they love their Queen!