AZ-900: Microsoft Azure Fundamentals - Core Cloud Concepts & Services

A cloud model where Azure manages the underlying OS, hardware, and infrastructure, allowing developers to focus solely on building, deploying, and managing applications (e.g., Azure App Service, Azure SQL Database).

A cloud security framework where security responsibilities are divided between the cloud provider and the customer. The customer is always responsible for data, devices, and accounts, while the provider handles physical infrastructure.

A cloud computing model providing maximum control over hardware, where the user rents virtualized servers, network infrastructure, and storage (e.g., Azure Virtual Machines, Azure VNets). You manage the OS, runtime, and apps.

A cloud delivery model providing end-user applications hosted and managed entirely by the vendor over the internet on a subscription basis (e.g., Microsoft 365). The customer only manages user access and configuration.

CapEx (Capital Expenditure): Upfront spending on physical infrastructure (servers, datacenters) with high initial costs and depreciation over time.
OpEx (Operational Expenditure): Paying for products/services as you use them (Pay-As-You-Go), with no upfront hardware cost.

Containers that help manage access, policies, and compliance across multiple Azure subscriptions. Hierarchy: Management Groups → Subscriptions → Resource Groups → Resources.

Logical containers into which Azure resources (VMs, DBs, VNets) are deployed and managed. All resources in a group should share the same lifecycle, allowing easy bulk management and deletion.