An HRIS is a computer-based system used to track employee data related to human resource management. It allows for efficient tracking of employee details, makes desired information available in the right form to relevant people, and provides necessary security and confidentiality of information. Key functions of an HRIS include creating and maintaining employee records, ensuring legal compliance, forecasting future HR needs, reducing manual work, and assisting managers with relevant data. While an HRIS increases efficiency and ease of data updates and storage, limitations include that the system cannot address organizational issues itself, potential breakdowns can occur, and expert costs may be exceeded.