Unequal representation refers to the disparity in the political power and influence that different groups or regions possess within a legislative body, such as Congress. This can result in some populations having a disproportionately lower voice in the decision-making process, often reflecting social, economic, or geographic inequalities. Factors like gerrymandering, apportionment, and the differing number of constituents in various districts contribute to this imbalance, raising concerns about fairness and equity in the political system.