Vendor oversight is the systematic academic study of the principles, processes, and governance structures employed by organizations to manage and monitor their relationships with external vendors. It examines the efficacy, risks, and value generation associated with third-party engagements across their lifecycle. This research domain investigates critical aspects such as performance monitoring, compliance adherence, risk assessment and mitigation, and the dynamics of vendor relationship management. Key characteristics include structured methodologies, risk-based approaches, reliance on performance metrics, and robust governance frameworks. Its significance lies in enabling organizations to ensure strategic alignment, mitigate diverse risks, optimize operational performance and value delivery, and uphold regulatory and ethical standards in their interactions with external service providers and suppliers.