Definition - What does Refresh Cycle mean?
Techopedia explains Refresh Cycle
There are two types of RAM: Static Random Access Module (SRAM) and Dynamic Random Access Module (DRAM). Among the two types, DRAM does the cycle more often because it is used for the computer’s main memory. DRAM is constructed to hold each section of the read data in a separate capacitor, where each capacitor represents one memory bit. This structure makes the storage of information much easier, but it also makes it more unstable if the memory refresh cycle will not recharge the DRAM memories.