What did Solomon Asch's conformity experiment demonstrate?

Solomon Asch's 1951 line judgment experiment demonstrated the power of social conformity. Participants were asked to match the length of a line to one of three comparison lines, an obviously easy task. However, they were placed in a group of confederates who unanimously gave the wrong answer. About 75 percent of participants conformed to the group's incorrect answer at least once, and overall conformity rate was about 37 percent across trials. Conformity increased with group size up to about five members and decreased when one other person gave the correct answer.