Optimization is a key subject in engineering and other real-world problems. Swarm intelligence has emerged as a novel and effective tool for solving optimization problems. This book introduces optimization techniques and approaches and demonstrates how optimization problems can be overcome with heuristic and swarm intelligence approaches. Chapters discuss Particle Swarm Optimization (PSO) and its applications in project management, convolutional neural networks, wave scattering problems, network efficiency, and multi-objective studies.