An HRIS is a systematic method to store and manage employee data to aid in planning, decision making, and reporting. It aims to provide the right information to the right people at the right time in an efficient and cost-effective manner. An HRIS integrates HR functions and information systems to help HR managers perform their duties effectively. It contains data on jobs, positions, people, and is used for applications like personnel administration, benefits management, and performance reviews. The key benefits of an HRIS include faster data retrieval, reduced costs, better analysis and decision making, and improved reporting.