文书有公文书、私文书,有专业文书、礼仪文书。公文书是国家机关处理公务的文书的总称,包括行政公文、司法文书、外事文书、军事文书等。私文书是专用于处理私务的文书,如私人信函、日记、证明文件、声明、遗嘱、家谱等等。专业文书是各个领域专用于处理日常工作业务的专用文书,如商务函件、进出口单证、广告、招标投标书、合同书等等,这些文书多用于处理具体的业务问题,公亦可,私亦可。礼仪文书用于全社会的社交礼仪,如庆贺、祭书、请柬、致词等。这几类文书因各自的功能不同而各有特点。本文将具体介绍私文书的特点和分类。 Documents are public documents, private documents, a professional instrument, etiquette instruments. Public documents is the general term for state organs dealing with official documents, including administrative documents, judicial documents, foreign affairs documents and military documents. Private documents are instruments that are used exclusively to deal with personal matters, such as personal letters, diaries, supporting documents, statements, wills, genealogies, and more. Professional instruments are special instruments used in various fields to handle daily work, such as business letters, import and export documents, advertisements, bidding proposals, contracts, etc. These instruments are mostly used to handle specific business problems. Also available. Etiquette instruments for social etiquette of the whole society, such as celebration, offering books, invitations, speech and so on. These types of instruments have their own characteristics because of their different functions. This article will detail the characteristics and classification of private documents.