Which of the following is a correct definition of volatile memory?
It loses its contents on failure of power supply.
Computer memory is broadly classified into volatile and non-volatile memory based on how it behaves when power is removed. Volatile memory, of which RAM is the most common example, requires a continuous supply of electrical power to retain the data stored in it; the moment the power supply fails or is switched off, all the data held in that memory is immediately and permanently lost. This is precisely why data being actively worked on needs to be saved to a non-volatile storage device (such as a hard disk or ROM, which do not require constant power to retain data) to avoid losing it during a power outage.
The idea that volatile memory retains its content despite a power failure is simply the opposite of what 'volatile' means, and the notions that its contents 'evaporate' or are lost specifically 'due to heat' are inaccurate, fanciful descriptions rather than the actual technical reason, which is the absence of electrical power. Therefore, the correct definition is that volatile memory loses its contents on failure of the power supply.
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