The document discusses the rhetorical device of parallelism. It defines parallelism as using similar grammatical structures in a series of words, phrases, or clauses to create a sense of balance or rhythm. This enhances readability and draws attention to the emphasized elements. Common examples of parallelism are provided, such as "I came, I saw, I conquered" and "What you see is what you get." The document also provides corrections to examples that lack parallel structure for improved reading. In summary, parallelism creates a balanced style that makes complex ideas easier to understand and holds the reader's attention.