Materials play a pivotal role in the development of soft robotics by serving as the building blocks that determine the capabilities, durability, and versatility of these intelligent machines. Understanding the properties and applications of different materials is fundamental to pushing the boundaries of soft robotics, enabling the creation of robots that excel in precision, strength, flexibility, and even biocompatibility. This course provides a comprehensive understanding on different smart materials that are used to build soft robots. It covers principles to design such robots by considering their designs, materials properties, operation environments, and actuation modalities, e.g., fluidic, electric, magnetic, and biological actuation. It also features different manufacturing techniques used to create soft robots, including molding, lithography, and 3D printing, while emphasizing material-specific considerations. Finally, it examines real-world cases where specific materials have been instrumental in enhancing the performance, durability, and efficiency of soft robotic platforms. Overall, exploring the diverse range of smart materials available for soft robotics unveils a world of possibilities, driving innovation and pushing the frontiers of what robots can achieve in different fields, from manufacturing and healthcare to exploration and beyond.