its - it's
Its is a possessive determiner. You use its to show that something belongs or relates to a thing, place, animal, or child.
The chair fell over on its side.
A bird was building its nest.
The baby dropped its toy and started to cry.
It's is a shortened form of ‘it is’ or ‘it has’.
It's just like riding a bike.
It's been nice talking to you.