The development of PDF began in 1991 when John Warnock wrote a paper for a project then code-named Camelot, in which he proposed the creation of a simplified version of PostScript called Interchange PostScript (… See more

A PDF file is often a combination of vector graphics, text, and bitmap graphics. The basic types of content in a PDF are:
• Typeset text stored as content streams (i.e., not encoded in plain text);
• Vector graphics fo… See more

A PDF file is organized using ASCII characters, except for certain elements that may have binary content. The file starts with a header containing a magic number (as a readable string) and the version of the format, for … See more