The document discusses the evolution of educational technology through different revolutions: 1) Printing press, 2) Libraries, 3) Computers. It describes how computers transformed into ICT in education by allowing various uses like communication, audiovisual media, and multimedia. Computers in classrooms allow teachers to demonstrate lessons, programs, and websites. The key programs installed on computers that support education are discussed. Finally, it examines how ICT like radio, TV, computers and the internet have been used to enhance teaching and learning.