So what is it, and how does it affect your plane?

If you want to understand parasite drag, you’ll need a little background on what “drag” is in general. When two masses are in contact, they resist each other’s motion. In the case of an airplane, air resists the forward motion of the airplane. So when it comes to flying, drag is the resistance of an aircraft’s movements through air….

 

Source: Parasite Drag: What Is It? | Boldmethod