A roller coaster is an amusement park ride that features a track with steep drops, sharp turns, and loops. Riders sit in cars that are securely fastened to the track, allowing them to experience thrilling speeds and sudden changes in direction. The design of roller coasters can vary widely, with some being wooden and others made of steel. The first roller coaster was built in the early 19th century in Russia, and since then, they have evolved into complex structures found in parks around the world. Safety measures, such as harnesses and brakes, are essential to ensure a safe experience for riders.