Light Roasts: Produces medium light brown beans. This roast is the norm for eastern USA. This roast is crips, has very subtle flavoring and is the most often used for cupping or professional tasting.
Medium Roasts: Produces more of a medium brown bean almost the color of dark chocolate. This roast is common in the western parts of the USA. This roast is a good choice to taste broad differences between coffees.
Dark Roasts: Produces dark brown beans. The beans will start to show some oily drops on the surface with this roast. Dark roast coffee is less acidic and will have almost caramel tasting undertones.