Portable Document Format (PDF) Basically is a doc that no matter what confuser or software you use, it will look the same and print out in the same format on another confuser , or printer .
It also compresses the file making it easier to e mail large files .
You can change them by checking save as . a list of formats will come up .
If you just want to post a doc that was in a pdf format just check file> edit > select all > right click on the highlighted text >check copy, then right click and paste it into where you want the doc .