When you’re in a hurry, you might write “it’s” when you really mean “its,” or the other way around. You need to be aware of this mistake and know when to use which.
It’s is a contraction of “it is” or “it has.” Its is a possessive determiner we use to say that something belongs to or refers to something.
It’s and its are among the most commonly confused words. They are pronounced the same, there’s a very small difference in how they’re written, and it’s also easy to mistake the contraction in it’s for a possessive. But the rules are very clear—it’s is the same type of contraction as “where’s” or “there’s,” and its is a possessive just like “my” or “your.”