Traditional stucco is made from a mixture of cement, sand, and water, and is applied in multiple layers to create a durable, hard surface. Synthetic stucco, also known as EIFS (Exterior Insulation and Finish System), is a multi-layered system that includes a foam insulation board, a base coat, and a finish coat. Synthetic stucco is more flexible and energy-efficient but can be more prone to moisture issues if not properly installed.