Bitcoin ETF stands for Bitcoin Exchange Traded Funds. A Bitcoin ETF is a fund that holds Bitcoin and creates shares that represent the value of Bitcoin the fund is holding. A fund manager holds Bitcoins and investors get a share in the fund. ETFs are traded like a stock during the day when stock exchanges are open. It allows traditional investors to speculate on Bitcoin without actually owning a Bitcoin. This way Bitcoin will become more available to a lot more investors. You don’t have to deal with complex things like holding your private keys as your fund manager holds Bitcoin on behalf of you. This also means investors will lose the rights and responsibilities that a Bitcoin key holder has. For example if there is a chain split you won’t be able to have the newly created coins on the forked chain.