In what context?
DVD RAM id defined as
DVD-RAM was the first recordable and rewritable standard to hit the market and was defined by the DVD Forum (dvdforum.org), which is composed of over 220 companies. DVD-RAM discs can hold 4.7GB per side (for a total of 9.4GB on a dual-sided disc), although other sizes and capacities are available. As a rewritable format for data on a computer, DVD-RAM discs are great. Some come in a plastic cartridge or housing that makes them physically incompatible with many devices, but DVD-RAM discs are not generally compatible with living room DVD players anyhow. You will find standalone living room DVD burners using the DVD-RAM format, and even some camcorders, but you should not consider DVD-RAM to be a general-purpose distribution format for video.