Bitters are concentrated flavoring agents made from herbs, spices, and other botanicals, often infused in alcohol. They are used in small amounts to enhance the taste of cocktails and other beverages, adding complexity and depth. Common types of bitters include Angostura and Peychaud's, each with unique flavor profiles. Originally created for medicinal purposes, bitters have evolved into essential ingredients in mixology. They can balance sweetness and acidity in drinks, making them a key component in classic cocktails like the Old Fashioned and Manhattan. Today, bitters are available in various flavors, catering to diverse palates.