Quantifiers are words or phrases used to express the quantity of a noun. They help us understand how much or how many of something there is. Common quantifiers include terms like some, many, few, all, and none. They can be used with both countable nouns, such as apples, and uncountable nouns, like water. In English, quantifiers can be specific or general. For example, "I have three books" is a specific quantifier, while "I have some books" is more general. Using quantifiers correctly helps convey clear information about amounts and can enhance communication in both spoken and written language.