There is a vast horizon of features that are available in PDFs. The content in it can have logical structuring elements, annotations, rich media, digital signatures and 3D computer graphics data (U3D); etc. Although, it is a 7-bit ASCII (American Standard Code for information interchange), yet, it may contain binary content as well. This file starts with a header which indicates how bits are used to encode information, succeeded by the version of the format. Furthermore, it is a subset of COS i.e. Carousel object structure, which expands to eight primary objects named as- Boolean Values (true or false), numbers, strings, names, arrays, dictionaries, streams and the null object. These files can also be password protected for security reasons.

Earlier the doc files just contained the formatted text but with the development, now these files may include numerous objects like charts, graphs,  tables and all other media components. It can also have a mail merge information. This aforesaid feature is used for mass mailing in which a number of letters with the fixed or same text are sent to multiple or distinct people with a different mailing address. Few word processing templates can be used to put content from database, spreadsheet or table into the text documents. In the 1980s, this extension was used by WordPerfect for their proprietary format but later in 1983, Microsoft chose to use this extension for their Microsoft Word which is their product. The specifications are not publically available for this file, yet, some of them are available in ‘Microsoft Open Specification Promise' which was released on 15th February 2008.

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