DVD-R for general and authoring use:
DVD-R is generally a popular CD-R format. Mainly, DVD-R for general use is used for simple features while DVD-R for authoring use can be used for more professional features. DVD-R for authoring use comes with privacy protection and duplication features.
DVD-RAM
This is quite different from DVD-R format. It is a kind of sector based disc that can be used with the desktop of a PC while inserted into a drive. DVD-RAM can be inserted into DVD-ROM to read the content of the disc.
DVD-RW
It is one of the most known DVD formats available in the market these days. It is supportive and is preferred by most users.
DVD+RW
It is one of the newest formats available and usually considered as not very supportive by the DVD forum, the accredited body that sets the standards for DVD. However, major electronics and computer manufacturers support DVD+RW format.