TTL (Through the Line) refers to activity that combines the mass approach (ATL) and the precise one (BTL) into one coherent campaign. The brand uses broad reach and direct delivery at the same time, making sure the message is consistent across channels. It is a natural approach today, because the customer meets the brand in many places anyway, and the artificial split into ATL and BTL corresponds less and less to reality. (Compare: ATL, BTL)