The significance of data architecture in big data lies in its ability to structure and manage the vast amounts of data generated today. Proper data architecture enables organizations to efficiently store, retrieve, and analyze data from various sources. It involves designing databases, data models, and data processing frameworks that ensure data quality and accessibility. A well-defined data architecture supports data governance and compliance, ultimately facilitating better decision-making and strategic insights. As businesses increasingly rely on data-driven strategies, effective data architecture becomes essential for sustaining competitive advantages.