2. Concept: reference books are edited and published every year, and news, events, data and statistical data in a year are collected and sorted by category.
3. Features: dense information, continuous publication, accurate materials and novel contents.
4. Types: comprehensive yearbooks, professional yearbooks, local yearbooks and statistical yearbooks.
5. There are yearbooks in all five volumes of Song History, Art and Literature. Not today. Today's so-called yearbook refers to a reference book that collects information, statistical data and other information in all aspects or aspects within a year or until the year of publication. Such as: world knowledge yearbook, education yearbook, etc.