DVD Multi is a specification for optical media drives. The specification was approved by the DVD Forum and was claimed to enable disc compatibility for virtually all formats officially created by the DVD Forum. However, DVD+R/RW is not included because it is not "officially" from the DVD Forum. LiteOn uses the term Super AllWrite instead, which essentially has the same meaning.
Drives with DVD Multi logo can read and write DVD-R/RW and DVD-RAM discs, and read DVD-Video and DVD-ROM. Some may also play DVD-Audio and/or DVD+R/RW discs. Version 1.1 is the current version (as of September 2009).
Super Multi or Super AllWrite refers to a drive that reads and writes CD-R/RW, DVD-R/RW, DVD+R/RW and DVD-RAM. They usually do not support LightScribe, HD-BURN or GigaRec either. Overburning may or may not be possible.