Over the past two decades, the growth of virtual schooling has been extensive. Virtual schooling is often described in terms of being either a supplemental or full-time program. Supplemental programs, generally associated with virtual schools, are those where a student is enrolled in a brick-and-mortar or traditional school with a physical location and the school allows the student to enroll in one or more online courses as a way to supplement their curricular offerings. This is common in schools with smaller student populations or in schools where the student demand does not warrant a wide range of elective courses. In contrast, full-time student programs, often described as cyber schools, are those where the students complete all of their courses in an online environment.
Barbour, Michael K. "Are Virtual Schools More Cost-Effective Compared to Traditional, Brick-and-Mortar Schools?" Technology in Schools: Debating Issues in American Education. Ed. K. P. Brady: Thousand Oaks, CA: Sage, 2012.