This document provides a history of educational technology used in classrooms from ancient times to present day. It describes some of the earliest technologies like the abacus and blackboards in ancient and 18th century classrooms. It then outlines the introduction and increasing use of televisions, radios, and computers in classrooms from the 1920s through the 1990s as technologies advanced. Finally, it discusses modern technologies commonly used today like interactive whiteboards, wireless microphones, and the growing role of the internet and educational software in classrooms. The document emphasizes that while technology cannot replace teachers, educators must keep pace with technological changes to remain effective in the digital age.