S And P 500 Futures
In short
These are financial contracts that allow traders to bet on or protect against the future price movements of the S&P 500 index.
In plain words
Instead of buying 500 different company shares, you buy one contract that tracks their combined value. It is a way to trade the direction of the US stock market quickly.
A simple example
If you think large US companies will do well next month, you buy a futures contract. If the index rises, your contract becomes more valuable and you make a profit.
Why it matters
They provide liquidity and allow big investors to manage risk. They also act as a global indicator of how the stock market feels about the economy.
Easy to mix up
Do not confuse these with the S&P 500 Index itself, which is just a list of values and cannot be bought directly.