What is data validation in spreadsheets?

• A. A feature that restricts input to a defined set of values or ranges.
• B. A tool to format cells automatically.
• C. A feature to sort data.
• D. A function to count cells.

Answer: (B)

Data validation in spreadsheets is a feature that enforces rules on what a cell can accept before the data is stored. The main idea is to restrict input to a defined set of values or a specific range, so entries stay consistent and valid. You might configure it to allow only items from a dropdown list, limit numbers to a certain range, or require dates within a range. If someone tries to enter something outside the rules, the program can show an error message and block the entry. This is different from formatting cells automatically, which only changes appearance; it’s also different from sorting data, which rearranges rows, and from counting cells, which uses a function to tally values.