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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 are varied according to use, often with competing formats within each category. ... 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 — DVD+R, DVD+RW, DVD-RAM, DVD-R, ... for mastering DVD video or data and is not typically available to the ...

www.blazevideo.com/blog/how-many-dvd-formats-are-there.html

Jul 31, 2014 ... DVD stands for digital versatile disc, digital video disc or digital video disc. ... Currently, there are five main DVD formats, namely DVD-VIDEO ( ...

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

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 one or the other ...

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 ...

www.deskshare.com/Resources/articles/video-dvd-formats.aspx

... about MPEG standards, Video DVD formats, CD, VCD, SVCD and much more. ... medium used, CD-R or CD-RW, is very inexpensive and widely available.

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 ... Disc Format.

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 ...