A MOOC (massive open online course) is an online course designed for unlimited participation and open access via the web. MOOCs provide traditional course materials like filmed lectures and readings, as well as interactive user forums to support community interactions among students, professors, and teaching assistants. While MOOCs saw significant growth starting in 2012, completion rates remain low, between 3-9%, with many students dropping out. Providers are experimenting with methodology like smaller course components and competency-based learning to improve completion rates.