A motion of no confidence (alternatively vote of no confidence, no-confidence motion, or (unsuccessful) confidence motion) is a statement or vote that a person or persons in a position of responsibility (government, managerial, etc.) is no longer deemed fit to hold that position: perhaps because they are inadequate in some respect, are failing to carry out obligations, or are making decisions that other members feel are detrimental. As a parliamentary motion, it demonstrates to the head of state that the elected parliament no longer has confidence in (one or more members of) the appointed government.
A censure motion is different from a no-confidence motion. Depending on the constitution of the body concerned, "No Confidence" may lead to compulsory resignation of the council of ministers or other position-holder(s), whereas "Censure" is meant to show disapproval and does not result in the resignation of ministers. The censure motion can be against an individual minister or a group of ministers, but the no-confidence motion is directed against the entire cabinet. Again, depending on the applicable rules, censure motions may need to state the reasons for the motion while no-confidence motions may not require reasons to be specified.
There are a number of variations in this procedure in parliaments. In some countries a motion of no confidence can be directed at the government collectively or at any individual member, including the Prime Minister. In Spain it is presented by the Prime Minister after consultation. Sometimes motions of no confidence are proposed even though they have no likelihood of passage, simply to pressure a government or to embarrass its own critics, who may for political reasons decide not to vote against it.
In many parliamentary democracies, strict time limits exist as to the proposal of a no confidence motion, with a vote only allowed once every three, four or six months. Thus the timing of a motion of no confidence is a matter of political judgement; using a motion of no confidence on a relatively trivial matter may prove counterproductive if a more important issue suddenly arises which warrants a motion of no confidence, because a motion cannot be proposed if one had been voted on recently. Sometimes, the government will choose to declare that one of its bills is a "motion of confidence" in order to prevent dissident members of parliament from voting against it.