Digital marketing involves promoting brands or products using electronic media such as the internet, mobile phones, and digital television and radio. Effective digital marketing relies on an attractive, mobile-friendly website as the central hub. Other important tactics include blogging to engage readers and build trust, optimizing social media like Facebook and Instagram, getting positive reviews to build trust, using email marketing to communicate with customers, and pay-per-click advertising on search engines like Google AdWords. Creating compelling calls to action is also important to attracting people and driving purchases.