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<br>In a DRAM chip, each little bit of memory knowledge is stored because the presence or absence of an electric charge on a small capacitor on the chip. As time passes, the fees in the memory cells leak away, so without being refreshed the stored knowledge would ultimately be misplaced. To stop this, exterior circuitry periodically reads every cell and rewrites it, restoring the cost on the capacitor to its original stage. Each memory refresh cycle refreshes a succeeding area of memory cells, thus repeatedly refreshing all the cells on the chip in a consecutive cycle. This process is usually carried out robotically in the background by the memory circuitry and is transparent to the consumer. Whereas a refresh cycle is occurring the memory isn't [accessible](https://www.dictionary.com/browse/accessible) for regular read and write operations, however in trendy memory this overhead is not massive enough to significantly decelerate memory operation. Static random-access memory (SRAM) is digital memory that does not require refreshing. An SRAM memory cell requires 4 to six transistors, in comparison with a single transistor and a capacitor for DRAM |
