Some and any are quantifiers used to indicate existence or lack of something. Some is used in affirmative sentences and offers, while any is used in negative sentences and questions. Both are used with uncountable nouns and plural countable nouns. For example, some can be used as "Would you like some tea?" and "There is some milk in the fridge", while any can be used as "There aren't any apples" and "Is there any milk in the fridge?".