ETFs, or Exchange Traded Funds, are a type of investment fund that tracks underlying assets like indices, bonds, commodities and divides ownership of those assets into shares. ETFs are traded on an exchange, and their value shifts during the day, due to buying and selling actions done by the traders. As ETFs trade just the same way stocks do, they do not have their own net asset value (NAV), and they are calculated once at the close of every market day.