Imagine you are a bird and you want to turn around quickly in the sky. One way to do this is called an "Immelmann turn." It is named after a famous pilot who used it a lot.
Here's how it works: first, you fly straight ahead. Then, you pull up on the controls to make your bird body go up into the sky. When you get high enough, you tilt your wings to the side so you start to turn.
As you turn, you keep pulling up on the controls to make yourself climb higher and higher in the sky. Then, you tilt your wings back to level out again. Now you are pointed in the opposite direction from where you started!
It's like doing a flip in the air, where you turn around and end up facing the opposite way. An Immelmann turn is a cool way for birds and planes to quickly change direction and surprise their enemies or catch their prey.