Marketing is Understanding
Great products need to know who their customers are, where the competition lies, and why their audience won't be able to live without them. Marketing is strategic storytelling, setting expectations, and having the knowledge you need to make smart decisions.
Marketing is choosing the right tactics to connect an audience and product. It may be TV ads. It may be growth hacking. It could be anything in between.
Know your market. Know your product. Know your competitors.
If you do these things, you will Know you have the best chance possible for success.