This has been bandied about for ages on this site, but I feel some very basic clarification may needed.
Single Player RPG
Linear, pre-fabricated storyline with some branching decision points.
World is a back drop or merely a set for scenes.
"Think of a line (or a path) as a metaphor for such a game."
MMORPG
Free destiny for players. Their dynamic in-game realities become their stories and need not be pre-written or overly guided.
World is the environment.
"Think of a circle."
Single Player RPG
Linear, pre-fabricated storyline with some branching decision points.
World is a back drop or merely a set for scenes.
"Think of a line (or a path) as a metaphor for such a game."
MMORPG
Free destiny for players. Their dynamic in-game realities become their stories and need not be pre-written or overly guided.
World is the environment.
"Think of a circle."