Okay kiddo, have you ever seen a flute before? It's a long skinny instrument that you blow into and it makes beautiful music. The western concert flute is a certain type of flute that is used a lot in classical music. It's made out of a shiny metal called silver, and it has a bunch of little holes that you cover with your fingers to make different notes.
When you blow into the mouthpiece at the top of the flute, the air travels down a thin tube inside the instrument and comes out the other end, where the holes are. When you cover the holes with your fingers, it makes the air go through different paths, which makes different notes come out. The higher the note you want to play, the more holes you have to cover up with your fingers.
The flute is held sideways, not up and down like a recorder or a clarinet, and you use a special technique called "embouchure" to make the right sound. That's just a fancy word for how you position your mouth on the mouthpiece, sort of like blowing across a bottle to make a sound.
People have been playing flutes for thousands of years, and the western concert flute has been around for a few hundred years. It's used in all sorts of music, from classical symphonies to jazz bands. So if you ever see someone playing a shiny silver flute in a big fancy concert hall, you know it's a western concert flute making all those beautiful sounds.