importance of digital marketing, and why it is essential

Assignment 1 (Marks -3)
Write a 500 words report for a line manager to explain the importance of digital marketing, and why it is essential, explain with an example the concept and how companies are using this 
Distribution marks 
·      The organisation of report 1 – Mark
·      Content – 1 Mark 
·      Quality of references (4-5) and proper citation – 1 Mark.