The interactive visuals in this book provide a novel instructional method for teaching the foundations of communication systems. The introduction of the content describes how bits are converted into digital waveforms. The discussion of quadrature phase shift keying (QPSK), binary phase shift keying (BPSK), m-ary quadrature amplitude modulation (M-QAM), m-ary phase shift keying (MPSK), LAN, packet delivery and the fundamentals of information theory are then built upon carrier modulation and quadrature modulation. There is also a description of conventional analogue modulation systems. The emphasis is on packet delivery techniques and internet protocols. The use of interactive graphics enables students to interact with and comprehend ideas related to communication systems. Students may quickly evaluate system trade-offs and design options thanks to interactivity and in-line explanations. An introduction to the usage of transmitter and receivers, the common technologies used in wired, wireless, and optical communication systems, concludes the subjects covered in the course.