Leads from SalesIQ > WebSite Visit

Leads from SalesIQ > WebSite Visit

Hi there,

SalesIQ directly creates leads, with "WebSite Visit" as the lead source.
We never chatted with them, they were not in our CRM before, they are not in destination lists in Zoho Campaigns.

I've read the page explaning how SalesIQ track data, but I can't figure out how they find these data, with professional email address...

Can someone help ?