What is Azure Bicep?

Azure Bicep is a domain-specific language developed by Microsoft for declaratively deploying and managing Azure resources using Infrastructure as Code (IaC). Bicep is essentially a more concise and developer-friendly abstraction over Azure Resource Manager (ARM) templates. Instead of manually creating resources through the Azure Portal, you define the desired infrastructure in a Bicep file. For example: Bicep Template ↓ Azure Resource Manager ↓ Azure Resources Why does Bicep exist? Traditional ARM templates use JSON. A relatively simple infrastructure definition can become difficult to read because of: Nested JSON Verbose syntax Repeated properties Complex dependencies String interpolation Large template structures Bicep provides cleaner syntax. Conceptually: ARM Template ↓ JSON ↓ Verbose Bicep ↓ Declarative DSL ↓ Cleaner infrastructure definitions Declarative vs Imperative Bicep is declarative. You describe: "This is the infrastructure I want." rather than: "Execute these commands in this exact sequence." For example, you might declare: I need: - Storage Account - App Service Plan - Web App - Application Insights Azure Resource Manager determines how the resources should be provisioned based on the declared configuration and dependencies. Basic Bicep structure A Bicep file commonly contains: Parameters Variables Resources Modules Outputs Conceptually: param location string = resourceGroup().location resource storageAccount 'Microsoft.Storage/storageAccounts@...' = { name: 'mystorageaccount' location: location sku: { name: 'Standard_LRS' } } The important concept isn't the syntax itself but the architecture. Parameters Parameters allow infrastructure to vary between environments. For example: Environment = Development SKU = Basic Location = East US versus: Environment = Production SKU = Premium Location = Central India The same Bicep template can potentially be reused. Modules For large enterprise environments, Bicep supports modules. Instead of putting everything into one huge file: main.bicep you can structure infrastructure into reusable components: main.bicep ├── network.bicep ├── storage.bicep ├── database.bicep └── application.bicep This promotes: Reusability Maintainability Standardization Team ownership Bicep and Azure DevOps/GitHub Bicep becomes particularly powerful when combined with CI/CD. A typical enterprise pipeline might look like: Git Repository ↓ Bicep Files ↓ Pull Request ↓ Validation ↓ CI/CD Pipeline ↓ Azure Deployment ↓ Dev → Test → Production This means infrastructure can be reviewed and version-controlled like application source code. Bicep vs Terraform A common interview question is: Bicep vs Terraform? Bicep Terraform Microsoft Azure-focused Multi-cloud Azure-native Provider-based Integrates directly with ARM Uses Terraform providers Excellent Azure resource coverage Broad cloud ecosystem Uses Bicep DSL Uses HCL Natural choice for Azure-centric teams Strong choice for multi-cloud If an organization is heavily invested in Azure, Bicep is often an attractive IaC option. Important distinction Bicep isn't a programming language for implementing business logic. It defines infrastructure. For example: C# → Application Logic Power Automate → Business Process Automation Bicep → Infrastructure Definition Interview-level answer Azure Bicep is Microsoft's domain-specific Infrastructure-as-Code language for declaratively defining Azure resources. It provides a cleaner syntax than ARM JSON templates while compiling down to ARM-compatible deployment definitions. Bicep supports parameters, modules, dependencies, reusable infrastructure patterns, and integration with CI/CD pipelines, making it well suited for repeatable and governed Azure infrastructure deployments.