Everyone who plays MMOs will be familiar with the concept of "grind", possibly one of the most debated topics in the MMO industry. Grind is essentially where users are forced to repeat something over and over again to get what they want. An example would be killing a certain type of monster repeatedly to get a certain piece of rare loot they can drop. Some people, such as World of Warcraft's Jeff Kaplan, suggest that grind and progression are essentially the same thing. Jeff asserts that we call progression a "grind" when it's not a fun experience and that grinding can be properly tuned. Whether you love it or hate it, repetitive elements exist in all MMOs and are necessary to maintaining long-term playability.