The term flavor profile refers to the combination of aromas and tastes that show up when drinking a coffee. You might notice cocoa, toasted nuts, stone fruit, berry, or florals. You might also notice how the coffee feels, such as tea-like, syrupy, creamy, or heavy. These sensations come from the bean itself, the roast, how fresh it is, and how you brew it.
In a blend, those notes become layered. A bright coffee can lift a base coffee that is chocolate-forward. A floral coffee can add a light top note that makes a medium roast taste more lively. A deeper coffee can add structure and make the finish feel longer and smoother. That layering is what many people describe as complexity.