Second-person pronouns refer to an addressee or a group including an addressee. An inclusive first-person pronoun refers to a group including both the speaker and the addressee, while an exclusive first-person pronoun refers to a group including the speaker but not the addressee.
A speaker can show politeness, familiarity, or a difference of social status to the addressee. This is called an addressee honorific. See also T-V distinction.
In postal terms, an addressee is the intended direct recipient of a letter or parcel.