Geosynthetic materials, typically made from petrochemical-based polymers (“plastics”) that are biologically inert and will not decompose from bacterial or fungal action, have revolutionized various engineering fields, particularly in construction, civil engineering, and environmental protection. These materials, which include geotextiles, geomembranes, and other related products, offer innovative solutions for soil stabilization, erosion control, and water management. In this article, we will explore the basics of geosynthetic materials, their applications, and the advantages they provide in modern engineering projects.