Mobile marketing is communicating and engaging with audiences through mobile devices. It can include mobile web, QR codes, SMS, MMS, in-game ads, and location-based marketing. Case studies show how companies like IHG, the City of Manor, Route 66 Harley-Davidson, BMW, and McDonald's used these tactics. Emerging trends include more social and augmented reality mobile marketing, as well as targeting audiences through data. Mobile should be integrated into all marketing campaigns given audiences' frequent device switching and adoption of mobile technology.