Wiktionary
n. (context computer hardware English) Computer memory (such as random access memory) that requires a constant electrical charge to maintain its contents.
Wikipedia
Volatile memory, contrary to non-volatile memory, is computer memory that requires power to maintain the stored information; it retains its contents while powered on but when the power is interrupted the stored data is lost very rapidly or immediately.
Volatile memory has several uses, for example as main memory. In addition to usually being faster than forms of mass storage such as a hard disk drive, volatility can protect sensitive information as it becomes unavailable on power-down. Most of the general-purpose random-access memory (RAM) is volatile.
Usage examples of "volatile memory".
The computer carried the schematics of the chip in non-volatile memory and would spot any manufacturing defects in it.
Degradation and damage to 5% of total on-line data storage devices, operational volatile memory at 57% of total, 3% of volatile memory free.
Unlike the Latinium's volatile memory arrays, the stacks holding the rare books seemed invulnerable to sabotage, even though most of those codices are written in the same Latin as the archival facsimiles.
After each lesson the computer would perform a final exam, writing another program for itself in volatile memory that it would use to move to the next lesson.
Each system tracked its own performance, in what was called Non Volatile Memory.