Forum Moderators: phranque
Say you're promoting www.example.com.
You get some direct type in traffic there, but you have no way of knowing if that traffic came from the tv ads or not, so you don't really know if they're effective.
Encoding it would be advertising an address like:
www.example.com/specialoffer
Then on that page you can track who comes from the television advertising, since the tv ad is the only place you advertise that specific address.
That's a guess. :)