This document provides a summary of the key concepts in electronic media, including radio, television, internet, and smartphones. It discusses the basic principles of electronic media such as their ability to reach large audiences quickly and provide choice. The major types of electronic media are described along with their history. Both the advantages, such as immediacy and creating awareness, and disadvantages, like health issues and laziness, are outlined. In conclusion, electronic media has become an important tool for educating and informing society through both consuming and creating digital content, though it also presents some risks if misused.