Educational technology refers to the use of technology in educational settings to facilitate learning and improve performance. It has its origins in early human cultures that developed systems for transmitting knowledge. In the 19th century, technologies like blackboards and textbooks were introduced. Visual media became widely used in schools by the 1920s. Later developments included instructional films, military training programs using technology during WWII, and computer-based instructional models in subsequent decades. Today's educational technologies include smart homes, wireless networks, virtual reality, and tools for individualized education. Technology supports building student research skills, enabling realistic inquiry, and providing appealing forms of presentation and access to learning resources.