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“Remove Duplicates” is a widely used data-cleaning tool that permanently deletes identical rows or entries from a dataset, leaving only unique values. While it is most famously known as a built-in feature in Microsoft Excel and Google Sheets, the concept of deduplication applies globally across text editors, databases, programming, and file management tools. How “Remove Duplicates” Works in Excel

When you trigger the tool, it evaluates your selected data row by row. By default, it keeps the very first instance of a data point and permanently deletes any matching rows below it. You can use the tool by following these steps:

Highlight data: Select your range of cells or click inside an Excel table.

Open tool: Navigate to the Data tab on the top ribbon and click the Remove Duplicates button.

Choose columns: A dialog box will pop up. Check “My data has headers” if applicable.

Set criteria: Select which columns must match to define a “duplicate”. Selecting all columns removes exact row clones. Selecting only one column (like “Email”) deletes rows with repeating emails, even if other columns differ.

Confirm: Click OK to see a summary statement detailing how many items were deleted and how many unique values remain. Key Constraints and Best Practices Find and remove duplicates – Microsoft Support