AZ-900 is a Microsoft Azure Fundamentals certification exam that tests the basic knowledge and understanding of cloud computing concepts, Azure services, pricing and support, security and compliance, and cloud computing models. It is designed for individuals who are new to Azure or have a non-technical background but want to learn about cloud computing. The exam consists of 40-60 multiple-choice questions and has a time limit of 85 minutes. Passing the AZ-900 exam demonstrates that an individual has a foundational understanding of Azure and can communicate effectively with technical teams.