Dark roast coffee refers to beans that are roasted at high temperatures, usually between 464-482°F, to achieve a robust flavor with low acidity. 

Dark roast means the coffee beans have been roasted longer and at a higher temperature than light or medium roasts. More roasting produces an unforgettably rich flavor with deep, often chocolatey or toasty notes.

Dark roast coffee typically has a more intense flavor due to the effects of high heat and extended roasting time.  

Dark roast coffee has a rich, full-bodied profile. The flavor can vary, but common tasting notes include chocolate, caramel, and smoke. 

Dark roast coffee has about the same caffeine content as light or medium roasts, averaging around 95 milligrams of caffeine per 8 ounces. However, brewing methods and bean types can cause slight differences.