The Settlers of Catan is by no means a frantic game so players can take their time and leisurely play.

This game teaches how to bargain, the meaning of scarcity and how free markets work.

There is no fixed number of players, so Settlers is flexible to many different groups of friends.
People can even work together in teams. Unlike chess, this is a game that promotes casual conversation
during gameplay, and generally a fun atmosphere, even when people are trying their best to win.

Allows you to develop a strategy and think ahead as well as forcing you to pay attention to what everyone else is doing.
"Through the complex, artful dance of algorithms and probabilities lurking at its core, Settlers manages to be effortlessly fun, intuitively enjoyable, and still intellectually rewarding, a potent combination that's changing the American idea of what a board game can be."

There are expansions for Settlers of Catan such as Explores & Pirates or Cities & Knights. Each one expands on the base game and also has another expansion of the same name that adds support for 5 to 6 players.