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What is the difference between S3 and EFS? When would you use each?

Cloud/Toolseasy0.5 min readPremium
Frequency
Low
Asked at 1 company
Category
179
questions in Cloud/Tools
Difficulty Split
104E|27M|48H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Wipro
Key Concepts Tested
etl
Expert AnswerPremium
90 wordsInterview-ready
**S3**: Object storage. Key-value; eventual consistency (strong for new overwrites). No filesystem. Use for data lake, backup, static assets. Cheaper at scale ($0.023/GB). **EFS**: File system (NFS). Shared across EC2/ECS/Lambda. Use when apps need POSIX, shared storage, or random write. **Trade-off**: EFS is more expensive; S3 is cheaper and scales infinitely. EFS when you need mount point, multi-writer, or legacy app compatibility. **Use S3**: Data lakes, ETL outputs, backups....
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 Wipro. The answer also includes follow-up discussion points that interviewers commonly explore.

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