Electronic file is a file that uses computer software such as word, Excel, PP, CAD and photoshop to edit the contents of paper documents. , and can be transmitted by mail, USB flash drive, network or other transmission methods.

On the Internet, PDF has almost become a universal file format, and many well-known websites use PDF for users to download application forms and documents (such as simulation questions on TOEFL websites).

Chinese translation of PDF is "portable document format". One of the characteristics of this file format is that it can embed fonts in the document and faithfully preserve the original appearance of the document, so it can span different operating systems and language platforms, and the format is unified, unlike Word documents, which have different formats due to different versions.

Extended data:

PDF is mainly composed of three technologies:

1, derived from PostScript, is used to generate and output graphics;

2. Font embedding system, which can transmit fonts with files;

3. Use an appropriate data compression system to bind these elements and any related content to a structured storage system of a single file.

PDF files use industry standard compression algorithms, which are usually smaller than PostScript files and easier to transmit and store. It is also page independent. A PDF file contains one or more "pages", which can handle each page independently, especially suitable for multiprocessor systems.

In addition, a PDF file also contains the PDF version used in the file and the positioning information of some important structures in the file. It is precisely because of its various advantages that PDF files have gradually become the new favorite of the publishing industry.

Baidu Encyclopedia-Electronic Edition