This document provides a brief history of digital marketing from 1999 to 2018, highlighting major developments and trends over time including the rise of search engines, social media platforms, mobile technologies, and data-driven advertising. Key events and technologies are organized within time periods including Pre-Digital Era, Google Time, Web 2.0, Platform Web, and Mobile First. The document also discusses future trends in digital marketing including augmented reality, virtual assistants, and contactless payments.