Digital marketing is broad but can be plainly described as: the creation, distribution of and engagement with, relationship or brand building content in an electronic format.
A lot of people will give you complicated answers where you will need a degree in rocket science to understand.
What to know what Digital Marketing is? Simple
Using the Internet to make money through various marketing methods tailored to your business.
That's the straight up blunt answer.
The reason you're looking at digital marketing is that you want to grow your business. Let the experts worrying about the mind-numbing stuff. You just want to know is it possible to grow your business through online methods and my answer is. YES.