PDF is short for Portable Document Format. The Portable part means that the document can be moved between different operating systems and still be readable on each system - so a PDF created on a Windows system will work on a Mac and vice versa.
In Windows, right click and select Properties, this will display the actual file size. Under Mac, secondard click and go to Get info.
They are two different file formats, which both can be used for pictures. The file format jpg [JPEG] is for pictures/screenshots/etc. The file name PDF stands for Portable Document File. PDF's are used in cross platform file sharing, like Windows to Mac and vice versa. The differences are that JPEG's are for pictures ONLY as PDF is used for cross platform sharing of [example] paperwork. PDF's are editable.
There are many sources offering comparisons between the Mac's and Windows shortcuts. One such is from New York university and is available as a PDF (See links below).
Portable Document Format (PDF)
I believe that both Windows Operating and Mac systems work with PDF Creator. Personally, I have used PDF Creator with my Windows Operating system at work.
Yes, you can burn a pdf or any file (a file not exceeding the data capacity of the cd) to a disk. You should be able to burn it on any computer that can burn a cd, without having extra software. With windows or a mac, you can burn files without another program.
Any page of text on a Mac can be saved as a PDF by selecting Print from the File menu (or pressing the command key cmd and P) and then selecting Save as PDF from the PDF options in the Print dialogue window.
The capitalisation of a file extention almost never matters. The Windows OS is confirmably case-blind when it comes to file extensions, and although I'm not 100% sure about whether Macs are the same, I've been able to open .JPG and .PDF (as opposed to .jpg and .pdf) files on my Mac with no problem. Some of the less common OS's (such as Linux) are case-sensitive, but I'm going to assume you use either a Mac or a PC.
Converting any file into a PDF is easier than you may think. Start by creating your file in a Word document or in a Pages document on a Mac. After saving the original, choose the export option. This will allow you to save the file as a PDF.
You can't exactly edit pub files on a Mac, but you can convert the file to PDF.
PDF - Portable Document FormatThis file format is created by Adobe Systems for exchanging of documents
With the file that you would like to print open, select file/print. For a PC, select the printer as a PDF writer (adobe, cutePDF, etc), then select print. For a Mac, select Save As. Then select save as a PDF. Select what file you would like the PDF saved to, and name it. Select save, and the document will be printed to a PDF.