What causes drag to make planes to go faster?

Drag is a resistance force that opposes an aircraft's motion through the air, primarily caused by air friction and pressure differences. To make planes go faster, engineers design aircraft to minimize drag through streamlined shapes, smooth surfaces, and advanced materials. Reducing drag allows for more efficient propulsion and higher speeds, as less energy is wasted overcoming air resistance. Additionally, increasing thrust from the engines can also help the aircraft overcome drag and achieve faster speeds.