The Rasengan is a powerful spinning sphere of chakra created by the character Minato Namikaze in the anime and manga series Naruto. It is a high-level technique that requires precise chakra control and is known for its destructive capability. The user forms the Rasengan by rotating chakra in their hand, creating a swirling ball that can cause significant damage upon impact. This technique is later taught to Naruto Uzumaki, the main protagonist, who adapts it and develops various versions, including the Rasenshuriken. The Rasengan is notable for its lack of hand signs, emphasizing the user's skill and mastery over chakra manipulation.