Educational technology is the study and ethical practice of using technology to facilitate learning and improve performance. Some key developments in educational technology include the introduction of computers in universities in 1946, the first computer-assisted instruction system called PLATO in 1960, the emergence of handheld calculators in 1970, the development of the internet and hypertext in the late 1960s and 1970s, and the growing use of multimedia, CD-ROMs, and the internet in schools from the 1990s onward. Modern educational technology continues to evolve with developments like digital video, virtual reality, voice recognition, wireless devices, and automated classrooms.