**Why IaC for pipelines**: Reproducibility, audit trail, environment parity. ARM (and Bicep) define ADF pipelines, datasets, linked services as JSON. **Architecture**: Use parameters for environment-specific values (dev/prod URLs, IR names). Reference Key Vault for secrets—never inline. In CI/CD: az deployment group create with parameter file. Use Git integration in ADF for version control; ARM deploys infra, Git syncs pipeline definitions....
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