This IDC Perspective discusses how enterprises are increasingly leveraging internal and external data to bolster their generative AI (GenAI) initiatives, transitioning from relying on public models to crafting more customized applications tailored to their unique requirements. This shift highlights a growing investment in a diverse array of data sources (i.e., internal, public, and third party data) to secure a competitive advantage, emphasizing the critical role of strategic data sourcing and governance in the rapidly evolving GenAI technological landscape."In the race for generative AI supremacy, the quality and diversity of your data aren't just fuel; they're your competitive edge, " says Lynne Schneider, research director, Data-as-a-Service and Data Marketplaces at IDC."To unleash the true potential of GenAI, enterprises across industries will continue to leverage third-party data along with proprietary data," says Ritu Jyoti, GVP/GM, AI and Data Research at IDC. "Aligning with a proficient and trusted third-party data provider will pivot an enterprise GenAI initiative toward a trajectory defined by accuracy and relevancy."