What is Static SRAM, sram devices, dram memory, static random access memory

 CY7C1021DV33 Series 1 Mb (64 K x 16) 3.3 V 10 ns Static RAM - TSOP-44

https://www.futureelectronics.com/p/semiconductors--memory--RAM--static-ram--asynchronous/cy7c1021dv33-10zsxit-cypress-7172489