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Dhivyaa NaraayaniDhivyaa Naraayani 

Updation of existing leads

I want to upload the existing leads with modified values of certain fields using a .csv file without duplication. 

How can I do that ?

Dhivyaa - Download the lead records from your org into csv including the fields you want to modify/update and Id of the field. Then using DataLoader (https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB0QFjAAahUKEwi0mrPL2JbGAhWFNbwKHQmADwk&url=https%3A%2F%2Fdeveloper.salesforce.com%2Fpage%2FData_Loader&ei=CWOBVfTxEoXr8AWJgL5I&usg=AFQjCNFBp9G3vIBbr5WZvfwaq9SZwarFhg&sig2=N9z0PL7Icg7xvocIdlZ9Hw&bvm=bv.96041959,d.dGc)you can able the update the record based on the Id field which is unique field of the object.

I strongly recommend you to take a look into this trailhead module, which helps you to understand the export/import process in salesforce https://developer.salesforce.com/trailhead/module/data_management and then go for activity.

Dhivyaa NaraayaniDhivyaa Naraayani
Thanks a lot, Karanraj :)