"Why is it called a *decision problem*? As a rea..."

A decision problem is a subset $D$ of a set of instances $A$, where generally $A$ is the set of finite bitstrings $\\{0,1\\}^\*$\.

Why is it called a decision problem? As a reader looking for an intuitive understanding, that's one of the first questions I want answered.

Is it about deciding things? Is "Where should we go to eat tonight?" a decision problem? :-)