Possessive noun in English Grammar

A possessive noun is a noun that is used to indicate that something belongs to someone. For instance, to the question, To whom does this bag belong?, you can say that it is Jessica’s bag. The word ‘Jessica’s’ is the possessive noun here. The general rule to show possession of an object is by adding an apostrophe and an ‘s’ to the end of the noun it belongs to. Examples :
1. The chef’s new dish was a hit.
2. The judges’ verdict was not acceptable to all classes of society.
3. Nobody could find the child’s toy.
4. The Earth’s climate has changed since global warming started.