Welcome to "Expanding Horizons: A Comprehensive Guide to Extension Education." This book is an invitation to explore the vast and dynamic field of extension education and its immense potential to empower individuals, communities, and societies. Extension education, also known as outreach or community engagement, plays a pivotal role in bridging the gap between knowledge and practice. It encompasses a wide range of disciplines, including agriculture, health, community development, and urban environments, among others. The fundamental goal of extension education is to facilitate the transfer of research-based knowledge and information from academic institutions and experts to individuals and communities who can directly benefit from it. In recent years, the importance of extension education has grown significantly, as societies face complex challenges and strive for sustainable development. Extension educators are at the forefront, working closely with diverse stakeholders to address pressing issues such as food security, climate change, public health, poverty alleviation, and social justice.