Why must Denmark’s cabinet resign after a vote of no confidence?

In Denmark, the requirement for the cabinet to resign following a vote of no confidence is a fundamental principle of its constitutional monarchy and parliamentary system.1

This mechanism ensures that the government maintains the support of the Folketing, the country's unicameral legislature. Because the prime minister and their cabinet ministers are responsible for running the government's departments, they must possess the confidence of the legislative body to remain in power. A vote of no confidence serves as a formal procedure by which the members of the legislature indicate that they no longer support the current government, thereby necessitating its resignation.123