How to Identify Website Visitors

How to Identify Website Visitors

I was just wondering what are the various ways that I can identify visitors coming onto our website. I know with SalesIQ - this can be done by using a ZOHO campaigns URL and also is done when a user completes a form. 

However, will these information (i.e. those already identified) sync through to ZOHO marketing hub? And are there any other additional ways I can identify visitors.

As obviously, to prepare a good marketing automation - the system will need to know who to send emails to etc.