Datafold is a data quality testing platform designed to identify data quality issues before they occur by utilizing data diffing, which involves value-level comparisons of tables within a data warehouse to detect changes between development and production environments. The platform is particularly suited for organizations that have adopted or are transitioning to a modern data stack (MDS) with SQL-based transformations, dbt, and version control systems, incorporating continuous integration (CI) processes. Datafold emphasizes the importance of automated testing during development and deployment to prevent potential issues and supports column-level lineage to understand data flow and its impact on downstream assets like BI dashboards. While dbt assertion-based tests and unit testing are effective for anticipated issues, data diffing is highlighted as essential for uncovering unexpected data changes resulting from code modifications. The platform integrates with tools such as Looker, Mode, Tableau, and Hightouch, and facilitates efficient cross-database diffing for migration and replication validation, ultimately empowering data teams to make informed decisions and maintain high data quality.