Caffeine, especially delivered in coffee form, is one of the most popular beverages around. You can hardly drive a block without seeing a coffee house, whether it's part of a massive chain or an independent neighborhood joint. With so many different kinds of coffee drinks available, and the massive choice of coffee beans and roasts at our fingertips, it's almost impossible to just "get a cup of coffee" anymore. Thus, we now have the career of barista.
A barista doesn't just make coffee. Great baristas know exactly how to "pull" a perfect shot of espresso. Grind the beans a little too long or not long enough and you end up with a bitter, acidic cup of coffee. Steam the milk incorrectly and it's bubbly and scalded instead of sweet and silky. Baristas also must know how to keep the machines clean and perform simple maintenance. And great baristas get to know their customers, their likes and dislikes, and even experiment with their own coffee creations.