Continuous Professional Development (CPD) has become an essential component of educational systems worldwide, enabling teachers to enhance their knowledge, pedagogical skills, professional competencies, and adaptability to changing educational environments. Rapid technological advancements, curriculum reforms, diverse student needs, and evolving educational policies require teachers to engage in lifelong learning and continuous improvement. This study investigates the role of Continuous Professional Development in improving teaching effectiveness, instructional practices, student outcomes, and institutional quality. A mixed-method research design involving 600 teachers, 120 school administrators, and 400 students from secondary schools and higher education institutions was employed. Quantitative and qualitative data were analyzed to examine the impact of CPD participation on teacher performance and professional growth. Findings indicate that CPD significantly improves pedagogical competence, technology integration, classroom management, assessment practices, and teacher confidence. However, barriers such as time constraints, inadequate funding, and limited institutional support hinder participation. The study proposes a comprehensive CPD framework and offers recommendations for strengthening professional development systems in educational institutions.