This lecture introduces High-Tech Architecture, an architectural approach that emerged in the 1970s emphasizing the expression of technology, structure, and building services as integral design elements. It traces the historical development of the movement from early industrial precedents such as iron and glass structures, prefabrication, and visionary projects to its full expression in late modern architecture. The lecture discusses the key characteristics of high-tech design, including exposed structural systems, industrial materials like steel and glass, prefabrication, and flexible modular construction. It also examines the influence of technological optimism during the late 20th century and highlights leading architects such as Norman Foster, Richard Rogers, Renzo Piano, and Nicholas Grimshaw, whose work demonstrates how architecture can celebrate engineering, efficiency, and technological innovation as a central aesthetic.