Acidity might not sound very nice but in the world of coffee, it's one of the key qualities of coffee flavor along with body and aroma. It’s a positive quality and should not be confused with sourness or bitterness.
Acidity is a sharp and pleasing taste, which you notice as a 'tingling' sensation on each side of the tongue. You could also call it sharpness, vibrancy, liveliness or brightness.
How much acidity should your coffee have? It’s a question of personal taste, but most people agree that without enough acidity coffee would be flat.
The acidity of a coffee depends on many factors, including the place of origin, the type of plant, the way it is roasted and the brewing method used.