Portable Document Format File .pdf is a type of Document created by Adobe back in 1990s. The purpose of this file format was to introduce a standard for representation of Documents and other reference material in a format that is independent of application software hardware as well as Operating System. Learn more about this file format herehttps//wiki.fileformat.com/view/pdf....Portable Document Format File (.pdf) is a type of document created...standard for representation of documents and other reference material...