The document discusses the roles and functions of educational technology in 21st century education. It argues that instruction should be student-centered and collaborative. Learning should engage students through hands-on activities and discovery while teachers act as facilitators. Educational technology provides 24/7 access to information, allows for social interaction and creation of digital content. It can be used to develop 21st century skills, support innovative teaching and learning, and create robust education support systems. Important functions of educational technology include improving teaching and learning, enhancing educational goals, training teachers, and developing curricula and teaching materials tailored to students.