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PDF (portable document format) files are one of the most commonly used file types today. Whenever you see a file that ends with .pdf, that means it's a PDF file.
Why use PDF files?
Let's say you create a newsletter in Microsoft Word and share it as a .docx file, which is the default file format for Word documents. Unless everyone has Microsoft Word installed on their computers, there's no guarantee that they would be able to open and view the newsletter. And because Word documents are meant to be edited, there's a chance that some of the formatting and text in your document may be shifted around.
By contrast, PDF files are primarily meant for viewing, not editing. One reason they're so popular is that PDFs can preserve document formatting, which makes them more shareable and helps them to look the same on any device. Sharing the newsletter as a PDF file would help ensure everyone is able to view it as you intended.
Creating PDF files
There are several ways to create PDF files, but the method will largely depend on the device you're using. For example, if you're using Windows 10 you can go to the Print dialog box, then select PDF from the list of printers at the top. This allows you to create a PDF of anything you would normally be able to print, including documents, emails, and webpages.
If your computer has Windows 8 or earlier, you have a few options. The simplest method is to use software that supports a PDF export, such as Microsoft Office or Google Chrome.
Source: https://edu.gcfglobal.org/
