what is a stock index when it comes to the s&p 500?

what is a stock index when it comes to the s&p 500? hello, i'm trying to understand what the S&P 500 is, and what a stock index is? why do people recommend the S&P 500? why a stock index? what does a stock index do? why is it a good investment? thank you
submitted by /u/How_To_Finance

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