CSV vs Excel (.xlsx): Differences, Pros, and Cons

### Key Differences at a Glance

| Feature | CSV | Excel (.xlsx) |
| --- | --- | --- |
| **Format Type** | Plain Text | Compressed OpenXML Binary/Zip |
| **Styling & Colors** | Not supported | Supported |
| **Formulas & Macros** | Raw text only | Supported |
| **Multiple Sheets** | 1 table only | Multiple Worksheets |
| **File Size** | Lightweight | Larger overhead |
| **Compatibility** | Universal | Requires Excel / Office tools |

### When to Use CSV
- Exporting database dumps and application backups.
- Transporting data between API endpoints, Python scripts, or ML pipelines.
- Storing large datasets with low storage overhead.

### When to Use Excel
- Building financial financial models with custom formulas and conditional formatting.
- Creating multi-sheet workbooks with charts and pivot tables.