“It’s” is the abbreviation of “it is”- e.g. It is a cat.
“Its” is a word that shows possession e.g. This is my cat and its name is Boo.
To check which one you should use, place “It is” in your sentence. If the sentence doesn’t make sense, the correct word will be “its”. For example:
Right: I have a cat. Its tail is long.
Wrong: I have a cat. It is tail is long.
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