In short
A QMS is the structure, and the software that supports it, through which an organisation systematically manages its quality policies, processes, records and improvement activities.
A quality management system covers control plans, inspection records, non-conformities, corrective actions, supplier quality, audits and document control.
A software-based QMS removes the sprawl of paper and spreadsheets, making quality data traceable and audit-ready. When integrated with production data, quality issues are caught earlier, at the source.