There are two types of random access memory, which are as follows:
Static RAM (SRAM): This RAM retains the data as long as power is provided to the memory chip. It need not be 'refreshed' (pulse of current through all the memory cells) periodically. It is very fast but much more expensive than DRAM. SRAM is often used as cache memory due to its high speed.
Dynamic RAM (DRAM): This RAM, unlike SRAM, must be continually refreshed to maintain the data. This is done by placing the memory on a refresh circuit that rewrites the data several hundred times per second. DRAM is used for most system memory because it is cheap and small
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