A bluff is a steep bank or cliff that rises sharply from a body of water or land. It is often formed by erosion and can be found along coastlines, rivers, and lakes. Bluffs can vary in height and size, and they are typically characterized by their steep, vertical faces. In a different context, "bluff" can also refer to a deceptive act or statement intended to mislead someone about one's intentions or abilities. This term is commonly used in games like poker, where players may pretend to have a stronger hand than they actually do to trick their opponents.