A proper noun names a particular person, place, thing, animal, or event. It begins with a capital letter.

Examples:

to see Jefferson

camping in Biak-na-Bato

on a rainy Sunday

bound for Bulacan

The words Jefferson, Biak-na-Bato, Sunday, and Bulacan are specific names referring to a person, places, and a day. These words are called proper nouns.