Open education focuses on sharing educational resources openly through tools like open licensing. There are two emerging models - one focuses on open educational resources like courses, software, and frameworks, while the other takes a more holistic view of open education as a culture emphasizing participation, networks, and freedom. Open education challenges existing systems by changing the roles of institutions, teachers, and students, and implications include issues around intellectual property, quality assurance, sustainability, and professional development. Open education advocates sharing knowledge as a public good enabled by technology.