Resource types are used to classify supplementary resources of arXiv eprints and users' documents.

• general: General online resources. Only used when other types may not apply.
• articles: Preprints, research papers, or technical web pages.
• reports: Reading reports or literature surveys on particular topics.
• lectures: Lectures given on conferences, workshops, seminars, and so forth.
• notes: Notes taken by participants for courses, summer/winter shools, and so forth.
• posts: Blog posts or periodically updated columns.
• questions: Original questions on research-level Q&A websites.
• answers: Constructive answers to the questions on research-level Q&A websites.
• problems: Original problems for a course or textbook.
• solutions: Complete solutions to the problems for a course or textbook.
• images: We only accept images in SVG and PNG formats.