Is the possessive of a noun an adjective or a noun?

Is the possessive of a noun an adjective or a noun?

1. The possessive case of adjective pronoun. My, your, his, its, their must be followed by noun. Pay attention to the difference between its and it's, the former is its possessive case, and the latter is the abbreviation of it's. 2. The possessive case of noun pronoun is the key and difficult point: it doesn't need to be followed by noun