Usually, -'s can mean either singular possessive or a contraction for "- is." "It," however, is a special case. "Its" is possessive, and "It's" is reserved only

Usually, -'s can mean either singular possessive or a contraction for "- is." "It," however, is a special case. "Its" is possessive, and "It's" is reserved only for the contraction of the phrase "It is."