Mobile marketing is an advertising activity that leverages mobile devices such as smartphones, tablets and similar handheld devices. It is closely related to digital marketing and can involve the sending of promotional messages to a specific audience. As marketers have become increasingly aware of the reach they can achieve through mobile devices, they have invested heavily in mobile marketing campaigns, particularly those targeting smartphones and tablets. Mobile marketing has become an integral part of any promotional activity as it allows brands to access a large number of potential customers with tailored messaging on their own device.