What's the difference between its and it's?
The word its is the possessive form of the pronoun 'it.'
The tree shed its leaves during the last two weeks of September.
The word it's is the contraction for the two words 'it' and 'is.'
The weather forecaster says it's going to rain most days next week.
A good rule of thumb is to only use it's when using it is would make sense.