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Document (foreign language abbreviation: DOC, foreign language full name: DOCument), doc is a common file extension of computer files, after the 2007 version: docx. This format was originally used as a plain text file, and it is mostly found in different operating systems and the instructions for the use of software and hardware. In the 1990s, Microsoft used doc as the file extension in the word processing software Word, and it became a popular format, and the former text-only format has almost disappeared.Download
PDF (short for Portable Document Format, meaning "portable document format") is a file format developed by Adobe Systems for file exchange in a way that is independent of applications, operating systems, and hardware. The PDF file is based on the PostScript language image model, which can guarantee accurate colors and accurate printing effects on any printer, that is, PDF will faithfully reproduce every character, color and image of the original.Download