There are two primary categories based on how they are consumed:
Also known as Amari (like Campari or Aperol ), these are "potable" bitters that can be sipped on their own or with ice to aid digestion. A Brief History What Are Bitters? | Bitters In Cocktails - VinePair bitters
Herbs, spices (cinnamon, cloves, anise), seeds, fruit peels (orange, grapefruit), and flowers. There are two primary categories based on how
Bitters are produced by infusing a neutral, high-proof alcohol (or sometimes glycerin) with a variety of botanicals, including: fruit peels (orange
Bitters are concentrated herbal extracts used as flavor enhancers in drinks and occasionally in food. Often called the of the bar, a few dashes can transform a drink by adding depth, complexity, and balance. What are Bitters?