Democracy is fundamentally defined as a system of government in which the majority rule. In a democratic system, decisions are made based on the will of the majority of the people, either directly (through referendums) or indirectly (through elected representatives). This principle is often expressed in Abraham Lincoln's formulation of democracy as "government of the people, by the people, for the people."
"Majority conquers" is incorrect because democracy is not about conquest or domination; the majority governs within a framework that also protects the rights of the minority. "Minority protest" describes an activity that may occur in a democracy but is not its defining feature. "Minority rule" is the opposite of democracy and is characteristic of systems like oligarchy or aristocracy.
It is important to note that while the majority rules in a democracy, this is tempered by the rule of law, constitutional protections, and respect for minority rights. The tyranny of the majority is guarded against by constitutional provisions.