The degree to which two variables are correlated. That is, covariance is the measure of how much two variables are related to one another. It is important in security analysis to determine how much or how little price movements in two companies or industries are connected.
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With 5.6 million subscribers as of the end of June 2015, World of Warcraft is currently the world's most-subscribed MMORPG, and holds the Guinness World Record for the most popular MMORPG by subscribers. Having grossed over 10 billion dollars as of July 2012, it is also the highest grossing video game of all time.