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Everyone who plays MMO games will be familiar with the term grinding.
Grinding is usually a simple way of gaining experience, levelling up your character and making money by performing a mind numbing repetitive action like killing an AI creature. World of Warcraft is renowned for grinding and since so many games have attempted to emulate their success the model they have adopted is very popular elsewhere as well.
There is no skill involved in grinding it is merely time consuming. With all the fun of repeatedly pressing an attack button the only reason to do it is because it is the easiest and most effective way of gaining experience and finding gold and material rewards. For gamers who prefer PvP gaming grinding lets them level up for combat as quickly as possible.
There are various types of grinding; solo monster slaying is the most basic. You can also complete quests to gain experience and grind along the way but in general they take longer and the rewards are less. Mob grinding is another possibility, groups teaming up to slaughter monsters but is it any less boring? You can check out this link to read about more of the problems with quest heavy advancement versus mob grinding.