The California State University (Cal State or CSU) is a public university system in California. Composed of 23 campuses and eight off-campus centers enrolling 437,000 students with 44,000 faculty members and staff, CSU is the largest four-year public university system in the United States. It is one of three public higher education systems in the state, with the other two being the University of California system and the California Community College system. The CSU System is incorporated as The Trustees of the California State University.