Educational technology plays important roles in 21st century education by supporting student-centered, collaborative learning with real-world context. It allows constant access to information and interaction, helping students learn how to learn. Schools should integrate technology comprehensively to develop 21st century skills through innovative teaching, and to create robust support systems. The functions of educational technology include improving teaching and learning, analyzing the process, enhancing educational goals, training teachers, developing curriculum and materials, and identifying community needs to prepare students for success in a competitive world with many opportunities.