Open your Salesforce Inspector and click on Data Import.
Choose the Salesforce object to which you will upload data.
Select Insert as your operation when you add new Salesforce records. Alternatively choose Upsert if you need to update Salesforce records.
Upload your CSV file to Salesforce by clicking on Choose File.
Now, map your fields from the CSV file to Salesforce.
Review your data for any errors, and then click Import to start the operation.
You will receive a confirmation message when your data has been imported into Salesforce.