Microsoft Word is the most popular, which has a free web-based version with Office Online, but you can also use Google Docs, OpenOffice, LibreOffice, and plenty of other totally free pieces of software. Unlike PDF files, DOC files can be easily edited with many programs. Adobe Acrobat is the most popular software for this, but it usually costs a lot of money. However, the downside of this versatility is that PDF files cannot be edited without special software.
For example, if someone created a PDF document on a MacBook, it would look the same on a Windows laptop, a smartphone, or even a TV. PDFs are great because they look the same on any screen. A PDF file - which stands for Portable Document Format - is a document that usually contains text, hyperlinks, and sometimes images.
