Quantifiers are expressions used in logic and mathematics to indicate the quantity of specimens in the domain of discourse that satisfy a given property. The two most common types of quantifiers are the universal quantifier, represented by ∀, which denotes that a property holds for all elements, and the existential quantifier, represented by ∃, which indicates that there is at least one element for which the property holds. In natural language, quantifiers can be seen in phrases like 'all', 'some', or 'none', which help convey the extent of a statement. Understanding quantifiers is essential for formal reasoning and is widely applied in fields such as computer science, philosophy, and linguistics.