The Sticky Note tool in Adobe Acrobat and Adobe Reader allows for commenting on your business PDF files. The tool can display notes in multiple colors and styles, just like its paper-based cousin ...

Of course, viewing is one thing; editing is another process. If you want to write something in an existing PDF file, and then save your changes, you have software such as, PDF Architect ...

Some people are going to be editing PDF files for their business, classwork or personal use. PDF editing is quite different than the note taking app, there are a few things you need to know about.