A type of non-volatile memory.
The technology is called 'Flash'. It makes use of electrical effects in a solid-state chip to store data rather than magnetism which a hard disk uses, or light as used to burn a DVD.
Flash devices come in many forms. For example camera memory cards and 'USB Memory sticks'
See also 'Technology explained' section on the home page menu to see a fuller explanation of Flash memory.
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Click on this link: Flash ROM