Okay, so the "Highland Fling" is a type of dance that comes from Scotland. It's called "Highland" because that's the name of a region in Scotland where people used to live.
When you do the Highland Fling, you make a lot of fancy footwork with your feet and legs. It's sort of like a jumping dance where you hop around on one foot, then on the other, and you lift and cross your legs in different ways.
The dance is usually done to music played by bagpipes, which are a traditional Scottish instrument that make a loud, droning sound. But you can also do the Highland Fling without music if you want.
People have been doing the Highland Fling for hundreds of years. It used to be a way for Scottish warriors to show off their strength and agility before going into battle. Nowadays, people do it just for fun or as part of traditional Scottish celebrations.
So, that's the Highland Fling! It's a special dance from Scotland that involves fancy footwork and is usually done to bagpipe music.