This document provides an overview of the history and definitions of educational technology. It begins by discussing how technology has evolved from its Greek origins to refer more broadly than just machines. The document then outlines key developments in educational technology, including contributions from thinkers like Comenius, Pestalozzi, Dewey, and Thorndike. It discusses how technology was applied during times like World War II and how recent innovations like computers, the internet, and smart boards have shaped the field. The document concludes by noting that while technology plays an important role, teachers will always be necessary.