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There are a variety of different DVD formats, including DVD+R, DVD-R, DVD+RW, DVD-RW, DVD-RAM and DVD-ROM.
R stands for Recordable, RW stands for ReWritable, ROM stands for Read Only Memory, and RAM stands for Random Access Memory. There is little to no difference between those labeled + or -.

en.wikipedia.org/wiki/DVD_formats

DVD formats describe the physical properties of the optical disc and how data is stored and ... caddy and used in compatible standard-tray drives. Rewritable many more times than other rewritable formats. DVD-AR: Recordable version of DVD-Audio ...

www.answers.com/Q/How_many_DVD_formats_are_available

There are at least 14 formats as listed below, but the Wikipediaarticle this is derived from (DVD Formats) was written in 2007, sothere are surely.

www.webopedia.com/DidYouKnow/Hardware_Software/DVDFormatsExplained.asp

Jun 5, 2009 ... With so many different formats how do users know which DVD ... is used for mastering DVD video or data and is not typically available to the ...

www.toptenreviews.com/software/articles/understanding-dvd-formats

All DVD formats – and there are many – have features in common and can be used for similar tasks: data storage, video, and audio recording. But even though  ...

www.lifewire.com/recordable-dvd-formats-1130689

May 11, 2017 ... The other two recordable format types (DVD-R/RW and DVD+R/RW) are essentially in competition with each other. There are many claims that ...

www.discwizards.com/articles/Glossary-CD-DVD-Blu-ray-HD-DVD-types.htm

A DVD-ROMs is supplied pre-pressed usually in DVD-video, although other formats are available. A DVD-ROM has a silver data side, whereas DVD-R's have a ...

www.osta.org/technology/dvdqa/dvdqa6.htm

What configurations of writable DVD discs are available? ... Manufacturers express disc capacity in terms of how much computer data a disc can contain. ... All writable DVD formats devote the same amount of usable space to data (2,048 bytes ...

www.ask.com/youtube?q=How+Many+DVD+Formats+Are+Available%3F&v=6GmqxkuUhqw
Aug 13, 2014 ... In this video I'm looking at the different CD and DVD Formats. ... Your browser does not currently recognize any of the video formats available.

www.digitalfaq.com/guides/media/dvd-formats.htm

Many Compaq, Packard Bell, Apple and Sony computers shipped DVD-R General drives in 2001 and early 2002, as the DVD+R format was not yet available ...