The most important treaty regarding foreign commerce came into force in Colombia since 1st august 2002. From that moment, the contracts of international sales of goods related to place of business located in Colombian territory become regulated by the Viena Convention of 1980, which implies the need of knowing, examinating and analize its scope of application, its regulatory particularities, its influence, reach, possibilities, advantages and effects. The following text initiates the reader in these matters from a legal point of view and in a easy understanding language.