The PDF format has become the most used in recent times, most people use this type of format to read books or to review important documents. It is very common to use this type of file in guides that are Assigned by the teacher for the subjects, this type of format begins to be present and very current, is one of the most popular formats.

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This type of format is used to exchange or submit documents reliably, regardless of the type of software, hardware or operating system. 

Its creator was Adobe and we can say that documents in PDF format are officially recognized by ISO, International Organization For Standardization, PDF files can have links, form fields (so it is often used as a spreadsheet), audio and video, also allows you to sign electronically and can be easily and freely viewed with Acrobat Reader DC.

You have the facility to scan documents and forms that are on paper to convert them into Adobe PDF format, getting quick access to all files, you can share and store them. 

If you need to sign a PDF document you can to do it electronically, without having to print the document to be able to sign, you must use Adobe Acrobat Reader DC that is available for phones, tablets and computers. In this way you can make your signature digitally or electronically.

PDF has its advantages 

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Because it respects the appearance and the intensity of the original documents, you can protect your files with password to avoid the visualization or modification of third parties. You can perform the search of words that appear in the text to make your reading easy. You can also make annotations and leave bookmarks. You have keyboard shortcuts that allow you to access some elements and allows you to adapt the file to different screen resolutions ranging from zooming to reducing the text size.

The type of PDF format allows you to create electronic documents, it is like having an office without using as much paper, 

The fact is that since the appearance of this type of file format has become very useful and practical for all people, especially for those who love to read and do not have the money to buy a book, can read it easily in PDF format also that there are thousands of pages that offer the best and most recognized books in PDF format so that those who want to download them and enjoy reading.nteractive documents with PDF files that are can be used as electronic forms where the entered data can be stored as in a database.

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The fact is that since the appearance of this type of file format has become very useful and practical for all people, especially for those who love to read and do not have the money to buy a book, can read it easily in PDF format also That there are thousands of pages that offer the best and most recognized books in PDF format so that those who want to download them and enjoy reading.