Data validation controls what users can enter into a cell. Excel can restrict entries to whole numbers, dates within a range, or values from a drop-down list.

This reduces errors and keeps datasets clean. Data validation is especially useful in templates, forms, and shared spreadsheets where consistent input matters.

Why It Matters

• Limits invalid or inconsistent entries
• Improves data quality
• Useful for templates and shared sheets

Reference:

Wikipedia: Microsoft Excel

https://en.wikipedia.org/wiki/Microsoft_Excel