The Belgian state bond is issued by the Belgian government to raise money from its citizens in order to fund various parts of government. It's issued four times a year and offers a fixed rate with an annual return that ranges in length of time but with a minimum of one year. The minimum investment amount is €100. The advantage of the state bond is that you know exactly how much you'll get at the end of year. On the flip side, you have to keep the bond until maturity, meaning your money is tied up. In contrast, you can sell an ETF at any time. In financial jargon, an individual bond like the state bond does not have the liquidity of an ETF.