This book brings together a curated selection of research in the broad field of smart materials, emphasizing their properties, functionality, and transformative potential. Covering diverse applications, from energy systems to biomedical advancements, it offers a snapshot of current innovations across multiple disciplines. The chapters begin with an introduction to smart material properties and their applications, progressing to in-depth discussions on topics like magnetocaloric effects in pyrochlore oxides, topological insulators, and magnetoelectric perovskites. Key studies examine magnetic nanoparticles for cancer biology, soft materials for sustainable technologies, and Pb-free perovskite ceramics with giant dielectric constants. Advanced research on nano-structured materials, material oxides in thin-film technologies, and photonic crystals further enrich this collection. A special focus is given to topological spin textures, such as skyrmions, and their applications in spintronic devices. From theoretical models to experimental insights, this book encompasses a wide range of topics that appeal to both established scientists and emerging researchers.