Roasting:Roasting is a heat process that brings out the aroma and flavor of green coffee beans. The roast level determines the color, flavor profile, and overall characteristics of the coffee beans after roasting.
Acidity:Acidity is basically what it sounds like: low-acid coffees are often called "smooth," and high-acid coffees are often called "bright."
Acidity is a primary coffee aroma perceived as a pleasant sharpness toward the front of the mouth, a numbing sensation on the tip of the tongue, or dryness at the back of the palate and or under the sides of the tongue. It expresses or helps define the quality of a coffee.
Acidity is one of the most important coffee characteristics used by coffee professionals to describe a coffee's flavor, along with body, aroma, sweetness, bitterness, and aftertaste. Acidity does not mean sourness, but rather the coffee's liveliness, and is a desirable characteristic. It has nothing to do with the coffee's acidity level (pH).
If the coffee you drink flows like water in your mouth without leaving much flavor or aroma, this indicates low acidity. If the coffee you drink has a sharp liveliness (not sourness), it means it has a nice acidity.
Body:In short, it's the feeling of weight and density that the coffee leaves in the mouth. You might not easily notice the body of coffee because it's a weight and a kind of "hardness strength" that we can distinguish with coffee, especially by pressing the tongue against the palate. Think of this as the difference between milk and water. Regardless of the flavors, consider the intensity and fullness of the sip.