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What is a bond fund?
As Michael Pryor answered, a bond fund is a mutual fund that invests in bonds. I'd also consider an ETF based on bonds to be a bond fund, but I'm not sure that all investors would consider these as "bond funds". Not all bond funds are the same -- just like stock funds. You can classify bond funds based on the issuer of the bonds: You can also classify funds based on the time to maturity: In general, bond funds have lower risk and lower expected return than stock funds. Sometimes bond funds have price movements that are not tightly correlated to the price movements in the equity markets. This can make them a decent hedge against declines in your equity investments. See Michal Pryor's answer for some info on how you can get tax free treatment for your bond fund investments.