"Much" is a term used to describe a large quantity or degree of something. It is often used in questions and negative statements to indicate that the amount is significant but not specified. For example, one might ask, "How much water do you need?" or say, "I don't have much time." In grammar, "much" is typically used with uncountable nouns, such as water, money, or information. It helps convey the idea of abundance or a high level of something, making it a useful word in both everyday conversation and written communication.