A motion or vote of no confidence (or the inverse, a motion or vote of confidence) is a motion and corresponding vote thereon in a deliberative assembly (usually a legislative body) as to whether an officer (typically an executive) is deemed fit to continue to occupy their office. The no-confidence vote is a defining constitutional element of a parliamentary system, in which the government's/executive's mandate rests upon the continued support (or at least non-opposition) of the majority in the legislature. Systems differ in whether such a motion may be directed against the prime minister, against the government (this could be a majority government or a minority government/coalition government), against individual cabinet ministers, against the cabinet as a whole, or some combination of the above.
A censure motion is different from a no-confidence motion. In a parliamentary system, a vote of no confidence leads to the resignation of the prime minister and cabinet, or, depending on the constitutional procedure at hand, a snap election to potentially replace the government.