Authors use figurative language to enhance their writing by creating vivid imagery, capturing emotional nuances, and engaging readers' senses. Figurative language adds depth and complexity to a piece of writing, making it more interesting and compelling for the reader. It can also help convey abstract concepts, convey feelings or emotions, and create a poetic or lyrical quality to the text. Additionally, figurative language can make writing more memorable and impactful, leaving a lasting impression on the reader.