Which type of RAM is considered non-volatile?

The correct answer is Flash memory, which is considered non-volatile because it retains its data even when the power is turned off. Non-volatile memory is essential for storing information that needs to be preserved across system reboots or power outages, making Flash memory widely used in various devices such as USB drives, SSDs, and memory cards.

In contrast, the other types of memory listed, such as DRAM, SRAM, and SDRAM, are all volatile types of RAM. This means they require a continuous power supply to maintain the stored data. Once the power is cut off, all information in DRAM (Dynamic RAM), SRAM (Static RAM), and SDRAM (Synchronous Dynamic RAM) is lost. Therefore, Flash memory stands out as the type of RAM that meets the criteria for non-volatility.