Editorial: Third Quarter 2020 IEEE Communications Surveys and Tutorials

I Welcome you to the third issue of the IEEE Communications Surveys and Tutorials in 2020. This issue includes 20 papers covering different aspects of communication networks. In particular, these articles survey and tutor various issues in “Wireless, Optical, and Sensor Communications,” “IoT and M2M,” “Network Security,” and “Internet Technologies.” A brief account for each of these papers is given below.