Lift-induced drag

All right.

And just to remind you from the beginning, right? Drag is the force that resists movement of an aircraft through the air.

There are two basic types.

Like I just said, we've got parasite drag and induced drag.

The full wake contains a downward flow behind the wing, often called downwash.

Creating that wake requires energy and produces induced drag.

A longer wing with the same area can reduce induced drag by spreading lift across a wider span.

Winglets reshape tip flow and can improve efficiency within design constraints.

They do not remove vortices.