This document discusses the roles of educational technology in learning from both traditional and constructivist perspectives. Traditionally, technology serves as a source and presenter of knowledge, but constructivism views it as a tool for learners to construct knowledge through exploration, hands-on experience, discussion, and reflection. Specifically, technology can support knowledge construction, provide information to facilitate learning-by-doing, serve as a social medium for learning through conversation, and act as an intellectual partner for learning through reflection.