The document discusses how educational technology has evolved and been used at different levels of education. It provides examples of materials used in preschool like abacuses and popsicle sticks. In primary school, there is less explanation needed on how materials work as students can use them based on experience. In secondary school, students prepare how technology can help develop their skills. At the tertiary level, the use of computers is maximized and learners predict future technologies. Overall, educational technology is used as a medium for students and teachers to gain more knowledge and improve their performance.