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PDF (Portable Document Format) was introduced in 1991 as a way to reliably view, print, and share information with other people. Regardless of the computer”s operating system, PDF was reliable and consistent, displaying and printing the same every time. As an open specification, it allowed everybody to “peek under the hood” to see how PDF was built, leading to a broader understanding and confidence in the young document format.

The first time Adobe actually talked about PDF 1.0 was at a Seybold conference in San Jose in 1991. At that time, it was referred to as ‘IPS’ which stood for ‘Interchange PostScript.’ Version 1.0 of PDF was announced at Comdex Fall in 1992 where the technology won a ‘best of Comdex’ award. The tools to create and view PDF-files, Acrobat, were released in on 15 June 1993. This first version was of no use for the prepress community. It already featured internal links and bookmarks and fonts could be embedded but the only color space supported was RGB.
The original code name for what later became the Acrobat software was ‘Camelot’, later renamed to ‘Carousel’. That is why the file type of a PDF file on Macintosh was ‘CARO’.

While the PDF specification was available for free since at least 2001,PDF was originally a proprietary format controlled by Adobe, and was officially released as an open standard on July 1, 2008, and published by the International Organization for Standardization as ISO 32000-1:2008.In 2008, Adobe published a Public Patent License to ISO 32000-1 granting a royalty-free rights for all patents owned by Adobe that are necessary to make, use, sell and distribute PDF compliant implementations.

PDF”s adoption in the early days of the format”s history was slow. Adobe Acrobat, Adobe”s suite for reading and creating PDF files, was not freely available; early versions of PDF had no support for external hyperlinks, reducing its usefulness on the Internet; the larger size of a PDF document compared to plain text required longer download times over the slower modems common at the time; and rendering PDF files was slow on the less powerful machines of the day.
Adobe soon started distributing its Acrobat Reader (now Adobe Reader) program at no cost, and continued supporting the original PDF, which eventually became the de facto standard for printable documents on the web (a standard web document).

Today, there are more than 200 million PDF documents posted on the web. PDF is the choice of government agencies across the globe. More than 1,800 vendors in the PDF ecosystem, worldwide, offer PDF-based solutions including technologies PDF creation, plug-in, consulting, training, and support.

How popular PDF files are! But there are something that pdf can not do, for instance, pdf can not be edited. So, if you want to edit your pdf files, how can you do? One way is to convert pdf to dwg with a pdf to dwg converter

DWG allows people to further edit, also, you can use a PDF to AutoCAD converter to convert pdf to dwg or dxf for further editing.