Sintering is a process in which heat is applied to a shaped body composed of numerous small solid particles, leading to microstructural evolution through the formation of interparticle bonds, densification, and grain growth. While it is a process underlying various natural phenomena, the combination of powder processing and sintering offers a versatile industrial technology for efficiently manufacturing complex-shaped components made of metals, ceramics, and composites. Many techniques and innovative methods have been developed to enhance sintering. It is crucial to understand the fundamental principles that support the different sintering techniques.