Coffee is one of the most popular beverages in the world, and the different species of coffee offer a wide range of aromas and tastes. The most popular species of coffee are Arabica, Robusta and Liberica. Each species has a different caffeine content and unique taste.

Arabica is the most widespread species of coffee and is mainly grown in South America and East Africa. Arabica coffee has a low caffeine content, around 0.8-1.4%, and offers a sweeter and smoother taste than other species.

Robusta is a less common species of coffee, but it is mainly grown in West Africa and Southeast Asia. Robusta has a higher caffeine content, around 2-2.7%, and offers a more bitter and stronger taste than Arabica.

Liberica is a lesser known and less cultivated species, but it is cultivated mainly in West Africa and Southeast Asia. Liberica's caffeine content is around 1.5-2.7%, making it less strong than Robusta but stronger than Arabica. The taste of Liberica is less sweet than Arabica and less bitter than Robusta.

In conclusion, the three species of coffee offer a wide range of aromas and tastes, depending on their caffeine content. Arabica has a low caffeine content, Robusta has a higher caffeine content and Liberica has a medium caffeine content. Each species has a unique taste and offers a different coffee drinking experience.