An HRIS is a software or online solution that handles data entry, tracking, and information needs for human resources, payroll, management, and accounting functions in a business. It typically manages all employee information, allows reporting and analysis of data, and integrates with payroll and financial systems. An effective HRIS tracks important details like attendance, pay history, performance reviews, and can help free up HR staff for more strategic work by allowing employees to update their own information. It provides data to support legal and ethical employee management.