This chapter explores the impact of online and blended learning on teacher preparation, highlighting its historical evolution, current trends, and future directions. The chapter examines how these learning models influence curriculum design, teaching practices, skill development, collaboration, and assessment in teacher education programs. It also addresses the challenges and limitations, such as technological disparities, lack of hands-on experience, and maintaining engagement in virtual environments. Emerging trends like personalized learning through AI, immersive technologies, global collaboration, and lifelong learning are also discussed, showcasing their potential to reshape teacher training. The chapter concludes by offering recommendations for enhancing online and blended teacher preparation programs, emphasizing the need for equity, technological access, and ongoing professional development. These recommendations aim to ensure that future educators are well-prepared to meet the diverse needs of 21st-century classrooms.