The Diplôme d'études en langue française or DELF is a certification of French-language abilities for non-native speakers of French administered by the International Centre for French Studies (Centre international d'études pédagogiques) for France's Ministry of Education.
It is composed of four independent diplomas corresponding to the first four levels of the Common European Framework of Reference for Languages: A1, A2, B1 and B2. Above this level, the "Proficient User" divisions are certified by the DALF.
The examinations are available in three varieties: "DELF Prim" which is for Primary school students (only available at A1 level), "DELF Junior et Scolaire" which is aimed at secondary-school aged students and "DELF Tous Publics" which is aimed at adults. Each variety is worth exactly the same and results in the awarding of the same diploma, but the material is varied to ensure that it is appropriate for the target cohort.
More information at: http://www.ciep.fr/es/delf-dalf