College of DuPage is a public community college with its main campus in Glen Ellyn, Illinois. The college also owns and operates satellite campuses in Addison, Carol Stream, Naperville and Westmont. With more than 20,000 students, the College of DuPage is the second largest provider of undergraduate education in Illinois, after University of Illinois Urbana-Champaign. The college serves students residing in Illinois' Community College District 502.

In the United States, community colleges are primarily two-year public institutions of tertiary education. Community colleges offer undergraduate education in the form of an associate degree. In addition community colleges also offer remedial education, GEDs, high school diplomas, technical diplomas and tech certificates, and in rare cases, a limited number of 4-year bachelor's degrees. After graduating from a community college, some students transfer to a four-year college or university to continue their studies leading to a bachelor's degree. Community college is tuition-free for selected students in 47 states, often under the name College Promise. Most community college instructors have advanced degrees but serve as part-time low wage employees.