Dungeons & Dragons or D&D is a fantasy role-playing game (RPG) originally designed by Gary Gygax and Dave Arneson, and first published in 1974 by Tactical Studies Rules, Inc. (TSR). It has been published by Wizards of the Coast since 1997. It was derived from mini-wargames with a variation of the Chainmail game serving as the initial rule system. D&D's publication is widely regarded as the beginning of modern role-playing games and the role-playing game industry. D&D departs from traditional wargaming and assigns each player a specific character to play instead of a military formation. These characters embark upon imaginary adventures within a fantasy setting. A Dungeon Master serves as the game's referee and storyteller, while also maintaining the setting in which the adventures occur and playing the role of the inhabitants. The characters form a party that interacts with the setting's inhabitants and each other. Together they solve dilemmas, engage in battles and gather treasure and knowledge. In the process the characters earn experience points to become increasingly powerful over a series of sessions. The early success of Dungeons & Dragons led to a proliferation of similar game systems. Despite this competition, D&D remains the market leader in the RPG industry. In 1977, the game was split into two branches: the relatively rules-light game system of Dungeons & Dragons and the more structured, rules-heavy game system of Advanced Dungeons & Dragons or AD&D, the 2nd Edition was published in 1989. In 2000, the original line of the game was discontinued and the AD&D version was renamed Dungeons & Dragons with the release of its 3rd edition with a new system. These rules formed the basis of the d20 System that is available under the Open Game License for use by other publishers. D&D version 3.5 was released in June 2003, with a 4th edition in June 2008. As of 2006, D&D remained the best-known and best-selling role-playing game, with an estimated 20 million people having played the game and more than US$1 billion in book and equipment sales. The game has been supplemented by many pre-made adventures as well as commercial campaign settings suitable for use by regular gaming groups. Dungeons & Dragons is known beyond the game for other D&D-branded products, references in popular culture and some of the controversies that have surrounded it, particularly a moral panic in the 1980s falsely linking it to Satanism and suicide. The game has won multiple awards and has been translated into many languages beyond the original English. Game Play:
Dungeons & Dragons is a structured yet open-ended role-playing game. It is normally played indoors with the participants seated around a tabletop. Typically, each player controls only a single character, which represents an individual in a fictional setting. When working together as a group, these player characters (PCs) are often described as a 'party' of adventurers, with each member often having his or her own areas of specialty that contributes to the success of the whole. During the course of play, each player directs the actions of his or her character and its interactions with the other characters in the game. This activity is performed through the verbal impersonation of the characters by the players, while also employing a variety of social and other useful cognitive skills, such as logic, basic mathematics and imagination. A game often continues over a series of meetings to complete a single adventure, and longer into a series of related gaming adventures, called a 'campaign'. The results of the party's choices and the overall storyline for the game are determined by the Dungeon Master (DM) according to the rules of the game and the DM's interpretation of those rules. The DM selects and describes the various non-player characters (NPCs), the party encounters, the settings in which these interactions occur, and the outcomes of those encounters based on the players' choices and actions. Encounters often take the form of battles with 'monsters' – a generic term used in D&D to describe potentially hostile beings such as animals, aberrant beings or mythical creatures. The game's extensive rules – which cover diverse subjects such as social interactions, magic use, combat, and the effect of the environment on PCs – help the DM to make these decisions. The DM may choose to deviate from the published rules or make up new ones if they feel it is necessary. Release 3.5 of the three core rulebooks. The most recent versions of the game's rules are detailed in three core rulebooks: The Player's Handbook, the Dungeon Master's Guide and the Monster Manual. A Basic Game boxed set contains abbreviated rules to help beginners learn the game. The only items required to play the game are the rulebooks, a character sheet for each player and a number of polyhedral dice. The current editions also assume, but do not require, the use of miniature figures or markers on a gridded surface. Earlier editions did not make this assumption. Many optional accessories are available to enhance the game, such as expansion rulebooks, pre-designed adventures and various campaign settings. ~~Wikipedia (I figured it would be a better summary than what I could come up with, on my own.) 
