This document discusses different types of pay-per-click (PPC) advertising and their effectiveness. It recommends using a combination of PPC in search engines and content networks to drive the best results. PPC in search engines is best for direct response goals while PPC in content can build a brand in addition to driving direct responses. Tracking customer attribution across multiple channels, including brand advertising, helps improve return on investment and loyalty over time. Success requires considering the full customer journey from initial awareness through final purchase action.