How would you categorize Digital Marketing & What are the most efficient and useful Digital Marketing tools?

The 2 main categories of Digital Marketing: Inbound – utilizing multiple platforms to make customers aware of the company’s doing. Outbound – reaching out to potential clients.
if you are a beginner but have done a course in digital marketing, you will know some of the common tools like Keyword Planner, Search Console, Google Analytics, etc. This question is also asked for Advanced Digital Marketing Interview and therefore it is good to be aware of some of the common digital marketing tools used by the industry professionals.