A Vendor Management System (VMS) is a centralized software platform that manages the complete lifecycle of vendor relationships — from initial qualification and onboarding through performance tracking, compliance monitoring, and eventual offboarding. For enterprises managing dozens to thousands of suppliers, a VMS replaces fragmented spreadsheets, email workflows, and shared drives with a single, auditable system that gives procurement leaders real visibility and control over their supplier base. Without a VMS, compliance gaps go undetected, vendor performance is impossible to measure consistently, and onboarding drags on for weeks of manual coordination.