This document provides context and analysis of Shakespeare's famous Sonnet 18. It begins with the full text of the sonnet, which compares the subject's beauty to a summer's day. The document then explains that a sonnet has 14 lines that typically presents a problem resolved at the end. For Sonnet 18, the theme is that the subject's beauty will not fade with time and will live on eternally through the poem. Evidence for this is found in lines that say her beauty and summer will not fade and the poem will give her life as long as it is read.