When you play with your toys or draw with crayons, you love when everything is in its correct place, right? Well, pianos are the same way! Pianos have lots of little parts inside that help make beautiful music when you play the keys. But sometimes those parts can move around and make the piano sound not so great.
That's where piano tuning comes in! Just like you might need Mom or Dad to adjust the strings on your toy guitar, piano tuners adjust the strings and other parts inside the piano to make sure everything is in the right place and sounds just right.
The tuner uses special tools to adjust the tension on the strings so that each note is the correct pitch. Think of tuning a piano like tuning a guitar - both instruments have strings that need to be tuned to the right pitch. But pianos are a lot bigger and have many more strings!
If the tuner does their job right, then when you play a song, every note will sound just right and you'll be able to play beautiful music. So just like how you want your toys to be in the right place, pianos need to be tuned to be in the right place too!