Personalized learning represents a paradigm shift in educational practices, emphasizing the tailoring of pedagogy, curriculum, and learning environments to meet the diverse needs of individual students. This paper explores the theoretical underpinnings, methodologies, and technological advancements that facilitate personalized learning in various educational settings, with a particular focus on K-12 education. It examines how data-driven approaches, adaptive learning technologies, and student-centered teaching strategies are integral components of personalized learning environments. The study highlights the role of artificial intelligence (AI) and learning analytics in creating adaptive learning paths that dynamically adjust to the learner's progress, preferences, and performance. Furthermore, it discusses the importance of teacher roles in facilitating personalized learning, including the design of flexible learning plans, the provision of targeted feedback, and the integration of collaborative and project-based learning activities that cater to individual strengths and interests. Challenges to implementing personalized learning, such as equity of access to technology, teacher training, and the scalability of personalized approaches, are also addressed. Empirical evidence from case studies and research literature suggests that personalized learning can lead to improved student engagement, higher achievement levels, and greater student autonomy. The paper concludes with recommendations for policy makers, educators, and technology developers to foster the adoption of personalized learning practices, including investing in professional development, ensuring equitable access to educational technology, and supporting research on effective personalized learning strategies.