What are the key differences between a Catan expansion and extension, and how do they enhance gameplay in the popular board game?

A Catan expansion adds new elements and rules to the base game, while an extension simply adds more of the same components. Expansions introduce new mechanics, scenariOS, and challenges, enhancing gameplay by providing fresh strategies and experiences. Extensions, on the other hand, primarily increase the variety and replay value of the game without fundamentally changing its core mechanics. Both expansions and extensions can deepen the gameplay experience and keep the game engaging for players who are familiar with the base game.