It is probably safe to say that everyone knows about the PDF format, and most people have used it at least once. This PDF format is very common and used alongside other popular types, such as DOCX, TXT, etc. However, not everyone knows exactly what PDF format is and why it is so widely used, especially in the professional field. In addition, there are actually various kinds of PDFs that can be used for different purposes. Read along to learn more about PDF file format, its types, and uses.