What is the European version of the S&P?

I'm curious to know, what exactly is the European equivalent of the widely recognized S&P 500 index? As an investor who keeps a close eye on global financial markets, I understand that the S&P 500 serves as a benchmark for the performance of large-cap U.S. stocks. However, I'm interested in diversifying my portfolio and want to learn more about the European market's counterpart. Could you please explain what index is commonly used as the benchmark for European stocks, and how it differs from the S&P 500 in terms of its composition and significance in the global financial landscape?