Rhetorical devices are techniques used in writing and speaking to persuade, emphasize, or create a memorable effect. They enhance communication by appealing to emotions, logic, or credibility. Common examples include metaphor, simile, and alliteration, which help to paint vivid images or reinforce ideas. These devices can also structure arguments and make them more compelling. For instance, anaphora involves repeating a word or phrase at the beginning of successive sentences, creating rhythm and emphasis. Understanding rhetorical devices can improve both the effectiveness of communication and the ability to analyze texts critically.