A stock market, equity market or share market is the aggregation of buyers and sellers (a loose network of economic transactions, not a physical facility or discrete entity) of stocks (also called shares), which represent ownership claims on businesses; these may include securities listed on a public stock exchange as well as those only traded ...
Redundancy is a system design in which a component is duplicated so if it fails there will be a backup. Redundancy has a negative connotation when the duplication is unnecessary or is simply the result of poor planning.
the state of being redundant. 2. superfluous repetition or overlapping, especially of words. 3. a redundant thing, part, or amount; superfluity. 4. the provision of additional or duplicate systems, equipment, etc., that function in case an operating part or system fails, as in a spacecraft. 5. Linguistics.