new refers to something that has never been previously experienced or known, or something that has recently been introduced or come into use. It functions as an adjective when describing a person, place, or thing.
rules for usage include the use of articles - when used in reference to a person or a thing, it is preceded by a definite article for previously encountered persons or things, and by an indefinite article for newly encountered persons or things.
1. She just brought home a new puppy.
2. You need to buy some new clothes for your trip.
3. Two new students joined the school this year.
when new is used as an adjective, it can be followed by a singular or plural verb.