Static RAM (SRAM):
This RAM can store data as long as power is not interrupted, without the need for periodically rewriting the data into memory. The main applications of SRAM are in areas where only small amounts of memory are needed or where high speed is required. SRAM is more speedy than DRAM. SRAM has the disadvantage of being costlier and having low power packing density.
Dynamic RAM (DRAM):
This RAM can also store data as long as power is applied, but the stored data will gradually disappear. So, it is necessary to periodically refresh the data to be reappeared. The main internal memory of most personal computers uses DRAMs because of its high storage capacity and low power consumption. The need for refreshing is a disadvantage of dynamic RAM because some external refreshing circuits is required.
Other types of RAM:
SDRAM (Synchronous Dynamic RAM), EDO RAM (Extended Data Output RAM)
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