"Casino" is based on the true story of the rise and fall of organized crime in Las Vegas during the 1970s and early 1980s. It follows the lives of casino manager Sam "Ace" Rothstein, portrayed by Robert De Niro, and his partner, mobster Nicky Santoro, played by Joe Pesci. The film, directed by Martin Scorsese, draws inspiration from the non-fiction book "Casino: Love and Honor in Las Vegas" by Nicholas Pileggi, which details the interplay of violence, greed, and corruption in the Las Vegas casino scene, particularly focusing on the Stardust Hotel and Casino.

Both "Casino" and "Goodfellas," directed by Martin Scorsese, are highly regarded films that explore organized crime, but they offer different perspectives. "Goodfellas" (1990) focuses on the rise and fall of a mobster, emphasizing a fast-paced narrative and character-driven storytelling. In contrast, "Casino" (1995) delves into the intricate operations of the Las Vegas casino scene, highlighting themes of greed and betrayal. While "Goodfellas" is often praised for its dynamic style and authenticity, "Casino" is recognized for its detailed depiction of the gambling world. Ultimately, which is better depends on personal preference.

No, "Goodfellas" is not a sequel to "Casino." Both films are directed by Martin Scorsese and are based on true crime stories involving organized crime in the United States. "Goodfellas," released in 1990, is based on the book "Wiseguy" by Nicholas Pileggi, while "Casino," released in 1995, is based on Pileggi's non-fiction book about the Las Vegas casino scene. Although they share similar themes and styles, they are standalone films with different plots and characters.