Can you buy SPX index?

Can I ask, is it possible to purchase the SPX index directly? I'm curious about the feasibility of owning a stake in this widely followed market benchmark. Are there any specific channels or platforms through which one can invest in the SPX index, or does one typically have to rely on derivative products like futures, options, or ETFs that track the index's performance? I'm interested in understanding the most direct route to gain exposure to the S&P 500 index.