Buying Gold ETF is purchasing gold in electronic form. You buy them just like you buy stock of any company from your broker.
Gold ETF makes it easier for you to invest in gold. The investment objective of Gold ETFs is to provide you with returns that closely correspond with the domestic price of real gold. Each Gold ETF unit that you buy is roughly equal to the price of 1 gm of gold.
They are easy to buy since you can even buy just one gram at a time. Over time, you can build up your gold portfolio to the level you want, just as you would with your bank or jeweler, only this is easier.