What ETF fund mirrors the S&P 500?

Could you please elaborate on which ETF fund accurately reflects the performance of the S&P 500 index? I'm particularly interested in identifying an ETF that tracks the S&P 500 closely, allowing investors to gain exposure to the broad U.S. stock market through a single, diversified investment vehicle. Could you recommend a specific ETF that is widely recognized for its close correlation to the S&P 500 index and its reputation for low fees and efficient trading?