A roller coaster feature is a type of thrill ride that is designed to provide an exciting experience for its riders. Common features of roller coasters include dips, drops, helixes, and loops. A DIP is a downward slope in the track, while a DROP is a steep descent. A HELIX is a spiral-shaped section of track, and a LOOP is a 360-degree turn. All of these features are designed to create a thrilling experience for riders.