 Hydrogels are a type of polymeric material composed of a network of hydrophilic molecules that can absorb large quantities of water. They have been widely used in various industries and environmental applications due to their high water retention capacity, extended service life, and availability of diverse raw materials. Increasing interest in the field has led to a proliferation of literature on the topic, including papers on classification based on different criteria, physical and chemical properties, and technical feasibility. Additionally, technologies employed for hydrogel production, process design considerations, and optimization of the manufacturing process were discussed. Finally, a new generation of hydrogel materials was introduced. This article was authored by Anas M. Ahmed.