1) Kind of computer data storage 2) Type of flash memory 
Synchronous DRAM, details ...
Synchronous dynamic random access memory; often used in digital cameras and other computing devices. SDRAM is a relatively new type of memory that runs at higher clock speeds than traditional memory
Synchronous DRAM
Synchronous dynamic random access memory; often used in digital cameras and other computing devices. SDRAM is a relatively new type of memory that runs at higher clock speeds than traditional memory. 
(Synchronous Dynamic Random Access Memory) SDRAM is DRAM that operates at the same rate as the bus clock frequency (e.g., 33 or 66 MHz).
Synchronous Dynamic Random Access Memory is a type of DRAM that can run at much higher clock speeds than conventional memory. SDRAM actually synchronizes itself with the CPU's bus.
Synchronous Dynamic Random Access Memory
Synchronous dynamic RAM - SDRAM incorporates new features that allow it to keep pace with bus speeds as high as 100 MHz. It does this primarily by allowing two sets of memory addresses to be opened simultaneously. Data can then be retrieved alternately from each set, eliminating the delays that normally occur when one bank of addresses must be shu....