Calcium silicate board and gypsum board are essential building materials, each suited for different applications. Calcium silicate board offers superior durability, moisture resistance, and fireproof properties, making it ideal for high-humidity areas and facades. Gypsum board, on the other hand, is lightweight, cost-effective, and easy to install, perfect for indoor ceilings and walls. Understanding their differences helps in selecting the right material based on environmental conditions and project requirements.