In addition to viewing documents, you can also make annotations and modifications. Thanks to this feature, PDF files have become a standard document distribution format online. Its main advantage is the ability to view the document's contents without having the option to edit it. PDF (Portable Document Format) is a document format developed by Adobe Systems. Although there are endless options when it comes to working with PDF, Adobe is one of the most recognizable and reliable names with an application for Mac. Adobe Acrobat Reader is an application for reading, editing, and creating PDF documents.