A rhetorical device is a figure of speech used to create a persuasive or impactful effect. It involves the use of language in a way that goes beyond its literal meaning to enhance the communication and convey a deeper message. Some examples of rhetorical devices include metaphors, similes, alliteration, personification, and rhetorical questions. These devices are often used in speeches, poetry, and persuasive writing to engage the audience, provoke thought, and manipulate emotions.