Definition of candidacy

Aspiration of anyone to any charges or honor
The concept of candidature is used in our language to refer to the aspiration of anyone to any charges or honour, or the proposal of an individual so that it occupies a position or dignity.
Widespread use in politics: aspiration of a political leader or personality to certain public office
Although this term is often used in different contexts, for example in employment or business level, is in the area of policy where it is most used and heard it for precisely the aspiration of a political leader or personality to certain public office, either Executive or legislative.

Candidates with political career or transformed into political celebrities

Popularly this person who aspires to a candidacy is called the candidate and must mention that it may be a person who holds a political path, i.e., is a career politician, either be an individual with social, have been featured in some work recognition, and that decides to venture into politics with a bid. This situation is common to see in politics, actors and musicians, among others, who suddenly are tempted by any party with which have ideological affinity and then choose to participate in politics.
Meanwhile, the parties often use this fame and favor from the public that holds the famous to add votes to their coffers.

Internal elections in the political parties to set nomination

Generally, at the behest of political parties which have a long tradition in politics of the country to which belong, nominations are determined as a result of the internal debate, i.e. the main leaders of the party decide who are the political dream pictures to deal with such applications. Or failing that, candidates, can be determined after internal elections, which just have the Mission of defining the candidates that will be presented in the corresponding elections.
These internal elections can be held only with the participation of members of the party or by the intervention of the population in general.
In Argentina, for example, held the step (primaries open simultaneous binding). In the same political parties and alliances of Parties present their diverse nominations and the population is that decides what will be the candidates who want to occupy them in the general elections that will be held later.