Bullion coins are typically made from precious metals like gold, silver, platinum, or palladium and are minted by governments or private mints. They're valued based on their metal content rather than their face value. These coins are often bought and sold for investment purposes due to their intrinsic value. They come in various weights and designs, and their value can fluctuate based on the current market price of the metal they contain. Some well-known examples include the American Eagle gold and silver coins, the Canadian Maple Leaf series, and the South African Krugerrand.