"Some" and "any" are determiners used to talk about the quantity of something. We use "some" in affirmative sentences and in questions when we expect the answer to be yes. For example, "I need some help" or "Would you like some coffee?" On the other hand, we use "any" in negative sentences and questions where we don't know the answer. For example, "I don't have any money" or "Do you have any plans for the weekend?" These words are used to talk about indefinite quantities and are important for making sentences in English.