Unanimity means that all participants vote for the
motion in question.
It is still the decision-making method used for some sensitive issues in the EU treaties as enlargement with new member states and de cisions on new EU taxes.
Furthermore, it foresees a general passerelle in Article 48.7 TEU: the European Council can move unanimity to QMV in all areas of the TFEU, including CFSP - but except defence, see Art. 48.7.1 TEU.