Literary devices refer to structures that writers use to convey messages to readers simply and effectively. They can be categorized as either literary elements or literary techniques. Literary elements are inherent parts of a work like plot, setting, characters, and theme. Literary techniques are specific structures like metaphor, simile, and irony that writers employ to help readers understand and appreciate the work on a deeper level. Both literary elements and techniques serve important functions like giving meaning, logical structure, beauty, and motivating the reader's imagination when used skillfully by writers.