Finding duplicates in Google Sheets can be a challenge, especially when working with large datasets. To identify duplicate email addresses collected through a form on a website, users can apply conditional formatting and custom formulas to highlight repeat values. This allows them to review and decide whether to delete redundant information. Additionally, Google Sheets provides an easy-to-use feature to remove duplicates automatically, ensuring accurate data analysis and workflows. For those who want to preserve their original data, the UNIQUE function can be used to extract a list of unique values from a specified range. By leveraging these features, users can efficiently manage their data and maintain its integrity.