Etimology
Equivalent to it + -s. From the earlier form it's (it + -'s), which is now considered nonstandard. Began to displace his as the possessive of the neuter pronoun in the Middle English period; had fully displaced it by the 1700s.
determiner
its
Belonging to it. [from 16th c.]
Examples
The manner wherewith our Lawes assay to moderate the foolish and vaine expences of table-cheare and apparell, seemeth contrarie to it's end.
since I have been at the Pains to write it, if he consents to it's being published I will follow my Friend's Advice, and chiefly yours.
That which groweth of its own accord of thy harvest thou shalt not reap, neither gather the grapes of thy vine undressed: for it is a year of rest unto the land.
They descended the hill, crossed the bridge, and drove to the door; and, while examining the nearer aspect of the house, all her apprehensions of meeting its owner returned.
The Chinese government is at war with its own people.
pronoun
its
The one (or ones) belonging to it. [from 17th c.]
Examples
[...] both Houses have resolved to rob the North of a good friend of its and yours.
EBay Canada argued in court that the data sought by tax collectors was not its to give.
...the Board of Trade of Chicago can at least feel that it has played its part manfully and patriotically, and that no act of its has stood in the way of National victory.
noun
its
plural of it