The Purdue OWL (Online Writing Lab) is a free resource created by Purdue University to assist students and writers with various aspects of writing. It offers guidelines on grammar, punctuation, style, and citation formats, including APA, MLA, and Chicago styles. In addition to writing resources, the Purdue OWL provides instructional materials on research, academic integrity, and professional writing. It aims to support learners at all levels, from high school to graduate studies, by enhancing their writing skills and promoting effective communication.