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Documents can be saved in many different formats. A common file format is the so-called PDF. The abbreviation stands for "Portable Document Format" and was introduced by the Adobe company back in 1993 to create its own format standard in comparison to Microsoft's DOCs.
The PDF files should be readable independently of an operating system or the software of large developers. For this purpose Adobe developed its own application called Acrobat Reader. With the Reader you have the possibility to view PDF files or create them. You can also convert other document formats like DOC files or TXT files to PDFs. This has the advantage that the documents can also be accessed on other operating systems, as long as they are equipped with Acrobat Reader.
Compared to other document files, PDFs are read-only. They cannot be changed in their content, structure or layout. That's why many companies prefer to use this type of file to post and send important documents online, such as contracts, manuals, and the like. With Acrobat Reader, however, users can specify exactly which areas of a PDF document may be edited. This is especially useful when end users need to enter their own data to sign a contract, or when they need to enter a signature. With other programs such as Word, such protection is only possible in a roundabout way, so using PDF files is much faster and easier.
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