The document discusses the roles and functions of educational technology in 21st century education. It defines educational technology as efforts to optimize learning through applying scientific methods and systems. The roles of educational technology include providing 24/7 access to information, facilitating social interaction and digital content sharing. Its functions are to improve teaching and learning, enhance educational goals, develop curricula and materials, and identify community needs. Overall, the document argues that educational technology should be integrated comprehensively into education to develop 21st century skills, support innovative teaching methods, and create robust support systems.