The difference between AZ-900 and DP-900 is mainly that the AZ-900 exam is designed for candidates beginning to work with Azure or intend to take their initial steps in the cloud, whereas the latter is ideal for those who want to learn the fundamentals of cloud data services and develop their core understanding of cloud data services in Microsoft Azure. The AZ-900 exam is suitable for Azure Cloud Architect, Azure Cloud Administrator, and Azure Consultant, whereas the DP-900 exam is suitable for DBA, Data Engineers, and Data Analysts.