Sonic the Hedgehog is a video game franchise created by Sega. The franchise primarily revolves around Sonic, a blue anthropomorphic hedgehog with supersonic speed, who often goes on adventures to thwart the plans of the villainous Dr. Robotnik, also known as Dr. Eggman, who seeks to conquer the world.

Sonic was introduced in 1991 with the release of the first Sonic the Hedgehog game for the Sega Genesis console. Since then, the franchise has expanded to include numerous sequels, spin-off games, animated TV shows, comics, and merchandise. Sonic is known for his signature speed, attitude, and ability to curl into a ball to attack enemies.

Over the years, Sonic has become one of the most iconic and recognizable characters in the video game industry, and the franchise remains popular with fans of all ages.