Style. Bitter belongs to the pale ale beer style and can have a great variety of strength, flavour and appearance, from dark amber to a golden summer ale. It can be under 3% abv and as high as 7% with premium or strong bitters.
Bitter is bitter compared to mild. Lagers range on both sides of bitter in bitterness, as well as color. The distinguishing features are more fruity character from yeast, lower carbonation, and often more hop aroma than lagers. Drinking at temperature near that of fermentation means bitter is served warmer than lagers.