Person grammar (first, second and third person) determines whether a person is speaking about themselves, being spoken to, or being spoken about.
When we talk about the first, second and third person we are talking about the relationship between the speaker and the listener.
If we are talking about one person or one thing, this is singular. If we are talking about more than one person or more than one thing, this is plural.
The speaker and any group including the speaker is always the first person.
The audience is always the second person.
The person being spoke about is always the third person.