In the second of three chapters outlining our major findings, we address the communal, personal, and interpersonal elements of undergraduate research. Framed by discussions of social belonging, campus-community belonging, academic belonging, this chapter examines how undergraduate research provides opportunities for new and closer friendships, for a deeper sense of connection to the campus, and for increased visibility and academic agency. Research alumni describe bonding with other researchers during intensive summer programs, gaining an insider view of the university, and overcoming academic imposter syndrome. Addressing the role of mentors and mentoring, we also highlight mentoring practices that undergraduate research alumni found most meaningful for increasing their sense of belonging.