Its is the possessive form of “it,” used to show that something belongs to or is connected with a thing, animal, or idea. When a dog wags its tail, the tail belongs to the dog. When a tree loses its leaves in fall, those leaves came from that tree. When a book has its pages torn, the pages are part of that book.

The tricky part about its is that it looks wrong to many people because it doesn't have an apostrophe. Most possessive words do: Sarah's bike, the dog's bowl, everyone's homework. But its follows the same pattern as other possessive pronouns like his, hers, and theirs, none of which use apostrophes.

Here's the key distinction: its (no apostrophe) means belonging to it, while it's (with an apostrophe) is a contraction meaning “it is” or “it has.” If you can replace the word with “it is” or “it has” and the sentence still makes sense, you need the apostrophe. If not, use its. For example: “It's raining” works because you can say “It is raining,” but “The house lost its roof” doesn't work as “The house lost it is roof.”

This confusion trips up even experienced writers, so learning the difference now will serve you well.