Human Capital Management (HCM), Human Resource Information System (HRIS), and Human Resource Management System (HRMS) are all tools used to manage human resources within an organization. They each have their own unique functions, but they all share a common goal to help organizations manage their employment force more efficiently.
HCM: HCM is a broad term used to encompass many aspects of personnel management such as recruitment, payroll administration, training & development, performance management, and employee engagement.
HRIS: HRIS is more specifically focused on the data side of things. It's designed to store information about employees such as contact information or past job history.
HRMS: HRMS is the platform that provides access to employee data and allows for efficient tracking of payroll, benefits administration, and performance reviews.