This document provides an overview of digital marketing. It defines digital marketing as marketing using digital technologies mainly on the internet, but also mobile phones and other digital mediums. It discusses key components of digital marketing including search engine optimization (SEO), pay-per-click (PPC) advertising, social media marketing (SMM), content writing, email marketing, mobile marketing, marketing analytics, and affiliate marketing. For each, it provides a brief definition and discussion of advantages and disadvantages. The document is intended as a presentation on digital marketing concepts.