Unmanned Aerial Vehicles (UAVs), which have uses in research, business, and public service, have recently emerged as a crucial component of the military’s operating environment. Drones of various varieties are being created to fulfill the demands of various users. As a result, the study topics in the UAV domain are expanding as the types and numbers of UAVs increase. In the recent years, the field of unmanned aerial vehicles has exploded. The nature of the study has been grouped into many groups, as well as an overview of existing research fields in the UAV sector. This category encompasses two types of studies: technical and operational research. The two categories of technical research are on-board and ground technologies. This overview is intended to serve as a starting point for beginners to the domain, guiding them in determining where to focus their research, identifying relevant research fields, and focusing on the correct topics.