ETFs group arbitrary assets into something that can be traded like a stock. So the closest comparison would be something like a gold ETF, which lets you buy and

ETFs group arbitrary assets into something that can be traded like a stock. So the closest comparison would be something like a gold ETF, which lets you buy and sell something like you would a stock with gold's approximate price. A Bitcoin ETF would let you buy and sell something like you would a stock with Bitcoin's approximate price. It's basically a wrapper class that lets people interact with things as if they were stocks.