What are the wingtips defined as?

The wingtips are specifically defined as the ends of the wings. This part of the wing plays a critical role in the overall aerodynamics and performance of an aircraft. Wingtips can influence lift generation and drag, which are essential factors affecting flight efficiency. Various designs, like winglets, are often incorporated into the wingtips to help reduce the drag caused by vortices at the tips, thereby improving fuel efficiency and overall aircraft performance.

In contrast, the other options describe different parts of the wing or components related to wing functionality but do not accurately define what wingtips are. The structural components inside the wing refer to the internal framework, while the leading edge describes the front part of the wing that faces the oncoming airflow. The hinge point of flaps and ailerons refers to the movable surfaces located on the wings, which have their own specific functionality and do not represent the wingtips themselves.