Capture user data that accesses my site [closed]

1

I was accessing the JBL website in the afternoon, minutes later I received a message in my email offering products without my having made it available to them.

Not that it's something new, but just now I'm curious: Does anyone know how it's done? You can tell me search terms for me to study.

    
asked by anonymous 19.01.2018 / 20:19

0 answers