This document provides an overview of online marketing and its various components. It discusses why online marketing is preferred over traditional marketing, citing advantages like low costs, flexibility, analytics, and demographic targeting. The main components of online marketing covered are search engine optimization, search engine marketing, social media marketing, affiliate marketing, email marketing, and app store optimization. Specific tactics for each of these components like link building, pay-per-click advertising, social media advertising, and email newsletters are also summarized.