Posse refers to two different things: a national nonprofit organization and a scholarship program that it offers. The Posse Foundation partners with select colleges and universities in the United States to provide student scholarships and leadership training. The unique Posse concept is centered on a cohort-based model that admits students to attend college as part of a "Posse" of 10 peers. Posse Scholars receive full-tuition leadership scholarships from Posse’s partner colleges and universities. The Posse Foundation identifies, recruits, and trains individuals with extraordinary leadership potential. Posse Scholars graduate at a rate of 90 percent, compared to 59% nationwide. The Posse Foundation has also launched several initiatives, including the Posse Arts Program, which supports cohorts of students in the creative arts.

In summary, Posse is a scholarship program offered by the Posse Foundation, which identifies and trains individuals with extraordinary leadership potential and provides them with full-tuition leadership scholarships to attend college as part of a "Posse" of 10 peers.