A two-year college, also referred to as a “junior college.” California operates three separate public systems for postsecondary education: two-year community colleges, the four-year California State University (CSU) system, and the most selective University of California (UC) system. In fall 2005, there were 109 community college campuses serving over 1,600,000 students. Anyone who is 18 years old or holds a high school diploma (or equivalent) is eligible to attend a community college. Students can transfer from community colleges to either the CSU or UC systems.