Web Analytics --web Bug

[ZappatoreDelWeb]

Salve, qualcuno sa che cosa sono i WEB BUG? e se si, come funzionano ? se possibile un esempio. Come si possono implementare in js ad es?
Grazie.

[mondiali_2010]

Dipende cosa ci devi fare.

Da wikipedia:

A web bug is an object that is embedded in a web page or email and is usually invisible to the user but allows checking that a user has viewed the page or email. One common use is in email tracking. Alternative names are web beacon, tracking bug, and tag or page tag. Common names for web bugs implemented through an embedded image include tracking pixel, pixel tag, 1×1 gif, and clear gif.