$981$ : retaining walls function in civil engineering projects? Explain the fundamental principles behind retaining wall design and their role in soil stabilization. Investigate various types of retaining walls, such as gravity, cantilever, and anchored walls, emphasizing their structural differences and applications. Furthermore, analyze factors influencing the selection of appropriate retaining wall types based on site conditions and project requirements. Additionally, discuss key considerations for ensuring the stability and longevity of retaining walls in diverse environmental settings."