The document discusses the roles of educational technology and how it can be both beneficial and harmful depending on how it is used. It defines educational technology as using tools like computers to address educational needs and problems. It also discusses learning theories like constructivism, generative learning, discovery learning, and meaningful learning. Dale's Cone of Experience is presented as a model showing different levels of learning experiences. When used properly, technology can serve as a teacher, partner in learning, and tool to support knowledge construction. However, it can be harmful if overused or causes addiction.