The use of thermoplastic foam injection molding technology opens up a variety of new possibilities that could not be utilized with conventional injection molding techniques. The foam injection molding process creates new markets for innovative product design. Optimal manufacturing capabilities and lower unit costs allow for applications across various industries and sectors. In addition to the numerous advantages of foam injection molding, there are also challenges in its application. For instance, suboptimal process management can lead to defective foam structures, which may negatively affect the properties of the components. Therefore, a good understanding of the process is essential for controlling it, enabling targeted optimization of components with desired properties. The reader will gain a comprehensive overview of the process.