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A core is a very small magnetic toroid, or doughnut. It can be magnetized in one direction or the other, so it represents one bit of memory. Core is also the term for the array of cores that make up main memory.

Very few computers use core anymore, as it is old, slow technology. Some people still refer to core, however, when they mean main memory. One advantage of core was that it was non-volatile, retaining its state through a power off state, but moderm memory does that as well with batteries and various "save to disc" strategies.

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