**Integration Runtime (IR)**: Compute infrastructure that executes ADF activities—data movement, transforms, and external calls. ADF is orchestration; IR is execution. **Types**: Azure IR (managed, cloud), Self-Hosted IR (on-prem), Azure-SSIS IR (SSIS). **Why it matters**: Every Copy activity, Data Flow, and external activity runs on an IR. IR choice determines where compute runs and what it can reach. **Scalability**: Azure IR auto-scales; SHIR scales by adding nodes....
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