How did pdf get to this point?

At first, PDF was only regarded as a page preview format, not a production format. However, the market does not feel this way, and the market expectation has changed the focus of this format, thus changing the product. All kinds of e-book readers are flooding the domestic and foreign markets, and have replaced paper media in many fields. The decline in the reading rate of paper media is largely due to readers turning their attention from paper media to e-books. Although the sales volume of e-book market is far from the traditional book market, it has a strong development momentum. Most e-reader manufacturers have started to support PDF format in whole or in part. PDF e-readers widely used in the market include Dangdang mobile phone reader, Baidu of Zhangmen Technology, September Reading of September Net, and the special reader for Android mobile phone developed. Adobe announced on July 3, 2009 that PDF/Archive(PDF/A), as a long-term storage format of electronic documents, has been approved by China National Standardization Administration Committee and officially implemented on September 3, 2009. PDF file has become the de facto industrial standard of digital information.