NVRAM ( Non Volatile Random Access Memory)
This NVRAM is general name given to the type of device which doesn’t loose data when power is turned off.
The best know NVRAM know today is flash memory.
Flash memory can be electrically erased and can be used and reprogrammed. This is commonly used in cell phones, digital cameras,
Flash memory is non-volatile, which means that no power is needed to maintain the information stored in the chip. In addition, flash memory offers fast read access times (although not as fast as volatile DRAM memory used for main memory in PCs) and better kinetic shock resistance than hard disks. These characteristics explain the popularity of flash memory in portable devices. Another feature of flash memory is that when packaged in a "memory card," it is enormously durable, being able to withstand intense pressure, extremes of temperature, and even immersion in water.
USB drives are also contains flash memory, it has two chips one is flash memory and other is microcontroller.
And note that though this flash memory is random accessed, still its slower then the RAM which we use in our PCs.
Source : follow the link
http://en.wikipedia.org/wiki/NVRAM
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