# Identifying Visitors

We use three methods of identifying visitors.

Field: "email" - if email field is passed in the event we use it as unique identifier of the customer. This applies to events originating from browser as well as server-side.

Field: "c_id" - this is a unique identifier generated by edrone JS script. It is stored in the browser local storage and passed in the event. If available we store mapping "c_id"-"email" so that we can uniquely identify customer based on "c_id" only in future events. This applies to events originating from browser only.

Cookie: "ccid" - this is a Third Party Cookie (Domain: "edrone.me") set by our system. It is automatically generated in response to the event set. If available we store mapping "ccid"-"email" so that we can uniquely identify customer based on "ccid" only in future events. This applies to events originating from browser only.

When the system receives an event it evaluates what identifying information has been provided, existing mappings stored and makes an identity decision.