What is "bitter"?

Bitter is a style of ale that originated in England and is characterized by its hoppy flavor and relatively high bitterness. Bitters are brewed using a mix of malted barley and hops, and are typically fermented at warmer temperatures than lagers, which allows the yeast to produce more complex flavors and aromas. The bitterness in bitters comes from the hops, which are added during the brewing process and impart a slightly bitter, herbal flavor to the beer. Bitters can vary in strength and color, with some being quite light and refreshing, while others are darker and more full-bodied. In the UK, bitters are often served at room temperature from a cask or hand pump, which gives the beer a slightly different flavor and texture than when served chilled from a bottle or can.