**Why it matters**: At scale, design choices directly impact reliability, latency, and cost. Wrong decisions compound across jobs and teams.
Move file in DBFS: `dbutils.fs.mv('dbfs:/path/source', 'dbfs:/path/dest')`. For directories: `mv` moves recursively. Alternative: read with `spark.read`, write to new path, delete source. For cloud storage: use `%fs mv` or Python `shutil` for local....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Infosys. The answer also includes follow-up discussion points that interviewers commonly explore.
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