Digital marketing involves promoting products and services through digital channels like the internet instead of traditional media. Today's consumers are overwhelmed by around 1 million marketing messages per year on average and have learned to tune out ads. As a result, digital marketers use strategies like internet marketing, mobile marketing, social media marketing, and viral marketing to engage consumers. These interactive approaches encourage participation and have seen rising spending, with digital marketing making up 21% of all marketing expenditures by 2020 according to one report.