The document discusses the roles and functions of educational technology in 21st century education. It outlines several key principles: 1) Educational technology aims to develop 21st century skills through maximizing the impact of technology in teaching and learning. 2) Instruction should be student-centered, collaborative, and provide context for real-world application. 3) Technology plays a fundamental role in education by developing skills, supporting innovative teaching methods, and creating robust educational systems through tools like online resources and digital content creation.