This study provides a comprehensive review of Human Resource (HR) documentation practices in the employee onboarding process. It emphasizes the critical role of structured documentation in ensuring legal compliance, maintaining accurate employee records, and facilitating effective integration of new employees into organizations. The paper explores various categories of HR documentation, including pre-employment, employment, and policy-related documents, and highlights their importance in improving communication, transparency, and organizational efficiency. It also examines the growing role of digital HR systems such as HR Information Systems (HRIS) in transforming traditional documentation practices by enhancing accessibility, data security, and administrative efficiency. Additionally, the study is grounded in Organizational Socialization Theory and Social Exchange Theory to explain how effective documentation practices influence employee engagement, job satisfaction, and performance. A conceptual model is proposed to establish the relationship between HR documentation practices and employee outcomes. The research adopts a conceptual methodology based on a systematic review of existing literature and identifies key challenges such as data security concerns, lack of standardization, and reliance on paper-based systems. The findings suggest that organizations adopting structured and technology-driven documentation practices can significantly improve onboarding effectiveness and long-term employee development. Overall, this study contributes to the understanding of HR documentation as a strategic tool in onboarding and recommends the adoption of standardized, digital, and efficient documentation systems for organizational success.