Looking at the waveform graph on the site, it looks like it turns the output to 1 when both inputs are 1, and turns the output to 0 when both inputs are 0 (In o

Looking at the waveform graph on the site, it looks like it turns the output to 1 when both inputs are 1, and turns the output to 0 when both inputs are 0 (In other words, it assigns the output to the inputs when the inputs are in agreement). Though, that's just a guess.