At level B1, the user becomes independent. He/she can maintain interaction: he/she can understand and maintain a discussion and give his/her opinion. He/she is capable of dealing with situations likely to arise in daily life.
Please note that DELF B1 is required to obtain the French nationality. It is also necessary to validate some diplomas. For example, it is the case for the diplomas of the AUF (Agence Universitaire de la Francophonie) and of the PFIEV (Programme de Formation des Ingénieurs d'Excellence au Vietnam).