Light roast coffee refers to beans roasted at a lower temperature, usually around 350-400°F. The roasting process takes a shorter amount of time than medium and dark roasts, and preserves the beans' natural flavors and acidity.

Light roast means the coffee beans are roasted just enough to develop their flavors without losing their natural acidity, giving a fresh and often fruit-forward flavor profile. 

Light roast coffee is less roasted, which preserves its natural flavors and acidity. In contrast, dark roast coffee is roasted at a higher temperature for longer, producing a bolder, smoky flavor with lower acidity. 

The average 8-ounce cup of coffee contains around 95 milligrams of caffeine, although this can vary by type of bean and brewing method. When measuring by volume, light roast coffee may have slightly more caffeine than darker roasts because the beans are denser. However, the caffeine content is similar if you measure the beans by weight.