http://www.waldenu.edu/Degree-Programs/Bachelors/Bachelor-of-Science-in-Nursing-Completion-Program.htm - A Bachelor of Science in Nursing or BSN is a four-year degree course that teaches the science and principles of Nursing. It is typically offered by universities, and there are also online BSN programs that can earn you a BSN degree. An online education program can also help the transition from RN to BSN for those who wish to advance their career.