This document provides an overview of affiliate marketing. It defines affiliate marketing as rewarding affiliates for visitors or customers brought to a business through the affiliate's marketing efforts. The document outlines the key roles in affiliate marketing including merchants, networks, publishers, and customers. It discusses best practices for setting up a successful affiliate program such as evaluating fit, strategic planning, piloting a program, and ongoing growth. The document also addresses common myths and challenges as well as provides a real-life case study example of Jenny Craig's successful affiliate program.