What is Packet Writing?

Packet Writing is a term for software that lets you record data onto a CD/DVD disk directly from Windows Explorer, My Computer, or from the File/Save As section of any computer program.

Simply put, it lets you treat a CD as a big floppy disk.  Without the Packet Writing software, you'd have to use CD recording software like Power2Go to create a disk.
Packet Writing allows you to build a disc piece by piece, easily. Each time you record some data onto a disc by "drag & drop" from like Windows Explorer, you're writing a "packet" of data onto the disc. This is the burning mechanism for which packet writing was named.