A tDCS Montage is the specific placement of the positive Anode and the negative Cathode electrodes on the head during a tDCS session. Only one montage should be per session, and sessions usually last for about 20-40min. Different Montages (electrode placements) have been shown to produce different results. For example, placing the Anode near the right temple and the Cathode near the left temple can accelerate learning speeds!
Checkout our tDCS Montage guide to learn more.