What is the theme of sonnet 18?

Sonnet 18 is one of the best-known of the 154 sonnets written by William Shakespeare. The poem is about a boy who is being compared to a summer's day. The speaker also mentioned that the boy will live forever, as long as the poem can still be read. But a little bit of Irony was added when one line said that the boy is not to be eternalized but he's characteristics will. But the poem contains no description of the boy, the poem more on focuses on the summer's day.

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