Answer:
A theme is a statement about a subject of a poem.
A theme is a poet’s message to readers through a poem.
Step-by-step explanation:
In poetry, a theme is a message or life lesson that a poem conveys about a topic or a subject, and that can be summarized in a single sentence (For example, Dreams can come true), and since such a message is often the reason why the author created the poem in the first place, the theme of a poem is also a poet's message to readers.