Digital marketing refers to marketing products and services through digital channels like websites, mobile apps, social media, search engines, and other similar platforms. It involves using these channels to understand customer behavior and attract customers through tactics like email marketing, content marketing, pay-per-click ads, social media marketing, affiliate marketing, video marketing, and SMS messaging. Some of the most common digital marketing channels companies use include website marketing, pay-per-click advertising, content marketing, email marketing, social media marketing, and affiliate marketing.