Dark roast refers to a coffee roasting process that results in beans that are dark brown to almost black in color. This roasting method typically involves higher temperatures and longer roasting times, which brings out a bold, rich flavor. The natural oils of the beans surface, contributing to a shiny appearance and a more pronounced bitterness compared to lighter roasts. In dark roast coffee, the caffeine content is slightly lower than in lighter roasts due to the longer roasting time. Popular varieties of dark roast include French Roast and Espresso, both known for their strong, robust flavors that appeal to many coffee enthusiasts.