Rhetorical devices are techniques used in writing and speaking to persuade, emphasize, or create a memorable effect. They help convey ideas more effectively and can enhance the emotional impact of a message. Common examples include metaphor, simile, and alliteration, which add creativity and depth to language. These devices can also clarify complex ideas or make arguments more compelling. For instance, anaphora involves repeating a word or phrase at the beginning of successive sentences, reinforcing a point. Overall, rhetorical devices are essential tools for effective communication in various contexts, from literature to public speaking.