Thankfully, you don’t need to buy fancy software for PDF joining. However, you usually need a piece of PDF editing software to do it, such as Adobe Acrobat. PDFs don’t have this problem: they look the same on all systems! Can you join PDFs together? That’s because DOCs connect with installed fonts and other specific attributes of an operating system, so there’s no telling what they’ll look like on other systems. If you save that file as a DOC and give it to someone else, the DOC will probably look a lot different for the second person. With DOC files, you usually create them in a word processor either online with something like Google Docs or in a standalone program such as Microsoft Word.
You might think a PDF is the same thing as a DOC. Sometimes, a person creates a PDF on a computer, but PDFs can also be scans of physical items, such as paper documents, ID cards, and more. In most cases, a PDF contains text, but it can also contain active links and even images.
A PDF file is a type of digital document.