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.
In information technology, the term redundant can refer to various situations: 1  The term redundant can describe computer or network system components, such as fans, hard disk drives, servers, operating systems, switches and telecommunication links that are installed to back up primary resources in case they fail.