The American Heritage Dictionary states bullion as gold or silver considered with respect to quantity rather than value. In other words pure gold or silver. In actuality bullion has to be at least 99.5% pure. Bullion is made up in the form of bars, ingots, plates, and coins too. There is little value to bullion other than the gold or silver content. Bullion is very liquid making it very easy to both buy and sell. You should invest in bullion if you are looking only to get the most gold or silver for your dollar.