Assistive technology (AT) has evolved significantly over the decades, profoundly impacting rehabilitation practices and patient outcomes. This entry explores the multifaceted integration of AT within rehabilitation, emphasizing historical models, contemporary innovations, and emerging trends. This entry begins by examining foundational models and definitions, including ISO 9999, which have shaped current practices and understanding. The entry then delves into recent advancements in AT, such as smart technology, wearable devices, and immersive systems, highlighting their applications, benefits, and ongoing challenges. Key frameworks, including the World Health Organizations GATE initiative, are discussed to provide a global perspective on the accessibility and allocation of AT. The review also addresses critical issues related to technological literacy, insurance coverage, and ethical considerations that impact the effective implementation of AT. By integrating historical insights with current and future developments, this chapter aims to offer a comprehensive view of how AT continues to transform rehabilitation, while also identifying areas for future research and policy development.