Tanja Sail is a fancy name for a piece of cloth that people use to fly away in the sky, just like birds! It's made of a special material that is very strong and can hold the weight of people. People attach the Tanja Sail to a big bag filled with air called a parachute, and then they jump off really high places like planes or tall buildings. As they fall, the Tanja Sail catches the wind and helps them float gently down to the ground, just like a leaf falling from a tree. It's really cool to watch people do it, but it's also very important to be safe and only do it with trained professionals!