What is it used for?

"It" can refer to various things, so without further context, it is difficult to give specific information about its usage.

Common uses of "it" include:

1. Personal pronoun: "It" is a pronoun used to refer to an object, animal, or concept that has already been mentioned or is easily identifiable in the context.

2. Placeholder subject: "It" can be used as a placeholder subject in sentences where the real subject is delayed or unclear, such as in "It is raining."

3. Gender-neutral pronoun: "It" is sometimes used as a gender-neutral pronoun when the gender of the subject is unknown or irrelevant.

4. Emphasizing a particular object or concept: "It" can be used to place emphasis on a specific noun in a sentence, such as in "I love it when it snows."

Overall, "it" is a versatile pronoun that serves various purposes in the English language.