How are tone and mood similar?

Tone is the author's attitude toward a subject.

Mood is how we are made to feel as readers, or the emotion evoked by the author.

Explanation:

They're the same because the it's how he author and the reader feel toward the story, The author makes the story and pour's his/her's feelings into it whilst the reader read's and understand's the book.

Readers understand's what the author is saying (the tone) and get the feeling the author felt while writing it (the mood).

A better way to understand tone is you don't have to look up 'How did John Green feel in The fault in our stars?'

Or what is the mood of 'To kill a mocking-bird?'