Why is this important?

Whenever a lead or contact fills out a form on our website or a landing page, we drop a cookie on their device. This allows us to track their subsequent interactions with our website and we use it to calculate their lead score. If you do not use Incognito Mode, our forms will drop a cookie on your machine and Hubspot will interpret your interactions as the lead you have just uploaded. 

In Hubspot, we use a contact’s email address as the unique identifier. Ensuring that the email address is correct prevents duplicate records being created on Hubspot. If this contact already exists on Hubspot, the additional information you have submitted will be added to the contact profile.