Essentially, a Bitcoin spot ETF is a type of investment fund that aims to track the price of Bitcoin directly. Unlike futures-based ETFs, which derive value from contracts speculating on future Bitcoin prices, spot ETFs seek to hold actual Bitcoin. This would allow investors to buy and sell shares of the ETF on an exchange, exposing them to Bitcoin's price movements without actually needing to purchase and store Bitcoins themselves.
In case, like me, you had no idea what a spot ETF was.