**7. Conclusion**

In this chapter, we have presented the state-of-the-art of UAV swarm technology that shows its promising application for different purposes, especially in the military fields. An overview of swarm intelligence, explaining its aspects, levels, mechanisms, followed principles, and significance, is provided in this chapter. Then, the challenges faced by a swarm and approaches given by different researchers are discussed. Moreover, to analyze the motion planning of a swarm, we have studied and compiled multiple kinds of research. All these research papers provide different approaches to counter the challenges faced by a swarm of UAVs. Many of these approaches are based on trending technologies like swarm intelligence and outperform the traditional strategies. All the findings show the significance of using a swarm rather than using a single UAV. Finally, we discuss the key findings of this paper with some limitations and suggest some recommendations for future work.
