This document summarizes key research on the phenomenon of college student undermatching. Undermatching occurs when academically capable students attend less selective colleges than they are qualified for. Low-income and first-generation students are most likely to undermatch due to a lack of information and support. However, research shows that providing students with guidance from counselors, coaches, or mentors can help them make better college choices and improve outcomes. The paper aims to inform policymakers and educators on effective practices to address undermatching.