1. Cultivation & Harvesting: Coffee trees grow in the tropical region known as the "Coffee Belt." When the coffee fruit (called a "cherry") ripened to a red color, it is picked by hand or machine.
2. Processing: The pulp and skin of the cherry are removed to get to the bean. The main methods include natural (sun-dried), washed, and honey processing, each imparting distinct flavors to the beans.
3. Roasting: This is the key step that determines the final flavor of the coffee. During roasting, complex chemical reactions (like the Maillard reaction) occur inside the beans, creating hundreds of aromatic compounds.
4. Grinding & Brewing: The roasted beans are ground into a powder, and their flavor compounds are extracted with hot water. Different brewing methods, from pour-over and espresso to French press, result in different taste experiences.

Caffeine is the primary alkaloid in coffee and a central nervous system stimulant. It temporarily wards off drowsiness and restores alertness. It works by binding to adenosine receptors in our brain, blocking the action of adenosine, which causes sleepiness.