The rapid integration of digital technologies has transformed traditional libraries into smart libraries that emphasize innovation, connectivity, and user-centered services. Smart libraries leverage emerging technologies such as artificial intelligence, data analytics, automation, and interactive digital platforms to improve access to information and enhance overall user engagement. This paper presents a conceptual and analytical study of user engagement models within the framework of smart libraries. The study examines key dimensions of user engagement, including accessibility, personalization, participation, and satisfaction, and analyzes how smart technologies influence user-library interactions. By synthesizing existing literature and theoretical perspectives, the paper proposes a structured understanding of user engagement models applicable to smart library environments. The study highlights the significance of strategic planning, technological integration, and user-focused service design in building smart libraries. The findings offer valuable insights for librarians, information professionals, and policymakers aiming to strengthen user engagement and improve library service effectiveness in the digital era.