This document reviews geosynthetics, which are synthetic materials used in civil engineering projects. There are eight main types of geosynthetics, including geotextiles, geogrids, and geomembranes. Geosynthetics have a variety of functions and applications, such as soil reinforcement, filtration, drainage, separation, and forming barriers. They have advantages like being economical and allowing faster construction. However, their long-term performance depends on factors like proper additives and quality control during manufacturing and installation. Overall, geosynthetics can strengthen soils and provide cost-effective solutions for various civil engineering construction needs.