Here's why:

* Lift: A force that acts perpendicular to the direction of fluid flow, pushing an object upwards. Think of an airplane wing.

* Drag: A force that acts parallel to the direction of fluid flow, resisting the motion of an object.

Essentially, drag is the force that tries to slow down or stop an object moving through a fluid.

Important Note: There are different types of drag, including friction drag (due to friction between the fluid and the object's surface) and pressure drag (due to pressure differences around the object).