Limes and lemons are both citrus fruits, but they have some differences in flavor, appearance, and usage. Limes are typically smaller and rounder than lemons, with a bright green color. They are more acidic than lemons and have a tart, slightly bitter flavor. Limes are commonly used in savory dishes, drinks, and desserts, particularly in Mexican and Southeast Asian cuisines. Lemons are larger and have a bright yellow color. They are less acidic than limes and have a sour, acidic flavor. Lemons are often used in both sweet and savory dishes, as well as in drinks and as a garnish.