You might need to create records in your Salesforce account only if some conditions are met in terms of form fields content. For example if a form field specified by you is not filled in by a user, no record should be created in Salesforce:
It applies to other conditions as well, like creating a record only if a certain field is empty. Here, you have to choose which field should not be completed:
Or send data only if an exact option is selected either from a Single Choice field or a Multiple Choice field:
To achieve this scenario, just make sure you select the condition based on which the data will be sent to Salesforce.