Before anyone invests in gold they need to know the actual gold bullion definition. Basically, what is gold bullion and what does it actually do? Gold bullion is actually the standard of money that determines the value of currency outside of the country. Those who invest in gold bullion actually help strengthen the value of their currency. This is one of the reasons that gold is one of the safest investments available and highly sought not only by the individual investor but by governments and other large financial institutions. Remember before you invest it is important to know what you are putting your money into; knowing the definition of gold bullion will allow you to make more informed decisions and secure a bigger return on your investment.