The words "less" and "fewer" are both used to describe a smaller quantity or number of something, but they are used in different contexts.
Less: Use "less" with uncountable nouns. Uncountable nouns are things that cannot be counted individually, such as water, time, money, and information. These nouns typically refer to a mass or an abstract concept.
Example: "I have less water in my bottle than you do."
Fewer: Use "fewer" with countable nouns. Countable nouns are things that can be counted individually, such as apples, cars, books, and people.
Example: "I have fewer apples than you do."
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