Static RAM or SRAM
SRAM or static RAM is a form of volatile memory.
It is called static because it keeps its data without the need for an external refresh signal constantly keeping the data in place, however it still needs constant power to keep its data and so it remains volatile memory.
It is very fast and for that reason it is a popular technology for creating caches.
It is not used as main memory because there is a cheaper but slower technology called DRAM or dynamic RAM.
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Click on this link: Explain SRAM memory