What actually is digital marketing?

Hubspot explains digital marketing as online marketing efforts based on electronic devices and the internet. Those businesses that are using digital marketing to their benefit, leverage various digital marketing channels like social media, video, search engines, content and other websites to interact and strengthen their bond with their current and potential clients.
According to Wikipedia, “Digital marketing is the component of marketing that utilizes the internet and online-based digital technologies such as desktop computers, mobile phones and other digital media and platforms to promote products and services.”