The type of friction that occurs when an object moves through a fluid is called fluid friction. It's also sometimes called viscous friction or drag.

Here's a breakdown:

* Fluid Friction: This is a general term for the resistance experienced by an object moving through a fluid (liquid or gas). It arises from the interaction between the object's surface and the fluid molecules.

* Viscous Friction: This term specifically refers to the frictional force arising from the viscosity of the fluid. Viscosity is a measure of a fluid's resistance to flow. Higher viscosity means more resistance to flow, leading to greater viscous friction.

* Drag: This is a more specific term for the force that opposes the motion of an object through a fluid. It's a result of the pressure difference between the front and back of the object, as well as friction between the object and the fluid.

So, while all of these terms are related, fluid friction is the most general term encompassing all types of resistance encountered when moving through a fluid.