Hi Shradha,

Duplicate Management is Salesforce's tool for preventing duplicates. When you attempts to create a new record that looks like a duplicate, based on the criteria you as an admin setup, a warning alerts the user that a potential duplicate exists.It maintain clean and accurate data.It builds the trust of your sales team and helps you work toward complying with various data protection and privacy regulations. Salesforce gives you tools for managing duplicates one at a time and across your org, and to track your progress in eliminating duplicates.