Abstention is a term in election procedure for when a participant in a vote either does not go to vote (on election day) or, in parliamentary procedure, is present during the vote, but does not cast a ballot. Abstention must be contrasted with "blank vote", in which a voter casts a ballot willfully made invalid by marking it wrongly or by not marking anything at all. A "blank (or white) voter" has voted, although his vote may be considered a spoilt vote, depending on each legislation, while an abstaining voter hasn't voted. Both forms (abstention and blank vote) may or may not, depending on the circumstances, be considered as protest vote.