The document discusses the framework of technological pedagogical content knowledge (TPACK). TPACK is a framework for understanding the knowledge teachers need to effectively integrate technology into their teaching. It identifies three main components - technological knowledge, pedagogical knowledge, and content knowledge - and describes their intersections as technological content knowledge, technological pedagogical knowledge, pedagogical content knowledge, and technological pedagogical content knowledge. TPACK is the basis for effective teaching that uses technology and requires an understanding of how to represent concepts using technology and appropriate pedagogical techniques.