First-person is a narrative mode where a story is narrated by one character at a time, speaking for and about themselves.
Second-person is a narrative mode in which the protagonist or another main character is referred to by employment of second-person personal pronouns and other kinds of addressing forms, for example the English second-person pronoun "you".
Third-person is a narrative mode in which each and every character is referred to by the narrator as "he", "she", "it", or "they".