Has is present tense, and used only for 3rd person singular. Has can be used as a main verb to indicate possession, or as a helper verb to indicate various tenses.

• Main verb, present tense: She has a car, and it has four seats.
• Helper verb: The weather has been good. He has written a book.

Has is also used with nouns that are plural in themselves, but that act collectively.

The team has a good chance of winning tonight.