History

The development of digital marketing is inseparable from technology development. One of the first key events happened in 1971, when Ray Tomlinson sent the first email, and his technology set the platform to allow people to send and receive files through different machines. In the 90s, the term Digital Marketing was first coined, with the debut of server/client architecture and the popularity of personal computers, the Customer Relationship Management (CRM) applications became a significant factor in marketing technology. The Internet development forced vendors to include more service into their software, for example, marketing, sales and service applications.

Conceptual scheme

Nonlinear marketing strategies involve efforts to adapt the advertising to different platforms, and to tailor the advertising to different individual buyers rather than a large coherent audience. Some studies indicate that consumer responses to traditional marketing approaches are becoming less predictable for businesses. According to a 2018 study, nearly 90% of online consumers in the United States researched products and brands online before visiting the store or making a purchase. The Global Web Index estimated that in 2018, a little more than 50% of consumers researched products on social media.
Here is a conceptual scheme to summarize which categories Digital Marketing is divided into.

Digital Marketing

SEO

SEM

Content Marketing

E-Commerce Marketing

Influencer Marketing

Data-Driven Marketing

Social Media Marketing

E-mail direct Marketing

Etcetera...