In the darkness of a cavern you see a glint of light like a reflection. It's gold ore! Gold ore is the fourth block in the creative inventory.
Gold ore only spawns in the layers from 0-32. Smelting it gives you one gold ingot. With the ingots you can make armor and tools. You can only mine gold ore with a iron or diamond which drops one gold ore. It is found in veins of 2-10. Gold tools work and wear out faster then every other tool.
Gold is the only thing that can't be mined by itself so it is not very useful. Gold might seem valuable but it isn't really. Gold is not very useful because you can't make much of anything with it.