Can I buy SPX on Fidelity?

Excuse me, could you please clarify if it's possible for me to purchase shares of the S&P 500 Index, specifically through the Fidelity platform? I'm a bit unsure of the offerings available and whether SPX, being a popular market index, is accessible for trading on Fidelity's interface. It would be immensely helpful if you could guide me on this matter, as I'm keen on diversifying my portfolio with such a widely recognized and tracked index. Thank you in advance for your assistance.