Judgment_paragraph 50 · Banco Santander SA v Mahamadou Demba and Mercedes Godoy Bonet and Rafael Ramón Escobedo Cortés v Banco de Sabadell SA (C-96/16, C-94/17)

50In that regard, it should be recalled that, in the context of the procedure referred to in Article 267 TFEU, which is based on a clear separation of functions between national courts and the Court of Justice, it is solely for the national court before which the dispute has been brought, and which must assume responsibility for the subsequent judicial decision, to determine, in the light of the particular circumstances of the case, both the need for a preliminary ruling and the relevance of the questions which it submits to the Court. Where those questions concern the interpretation of EU law, the Court is bound, in principle, to give a ruling (judgment of 20 September 2017, Andriciuc and Others, C‑186/16, EU:C:2017:703, paragraph 19 and the case-law cited).