Espresso roasts refer to coffee beans that are specifically roasted to create a rich, concentrated flavor ideal for brewing espresso. These roasts typically range from medium to dark, allowing for a balance of sweetness and bitterness. The roasting process enhances the natural oils in the beans, contributing to the crema, a creamy layer that forms on top of a well-pulled espresso shot. The choice of roast can significantly affect the taste profile of the espresso. Darker roasts often have a bold, smoky flavor, while medium roasts may offer more acidity and fruity notes. Popular varieties for espresso include Arabica and Robusta, each bringing unique characteristics to the final brew.