Tone refers to

the general feeling or attitude of a text towards its subject matter
the poem’s situational context
the poem’s deeper meaning
the invented character who narrates in place of the autho

Tone refers to the general feeling or attitude of a text towards its subject matter. For example, some texts can have a lighthearted tone, while others are decidedly darker.

Abiography is a description of a real person's life, including factual details as well as stories from the person's life. biographies usually include information about the subject's personality and motivations, and other kinds of intimate details excluded in a general overview or profile of a person's life.