You want to exemplify that you understand the importance of advertising and marketing within the industry. In really competitive industries, advertising is a way to try and increase customer and client engagement, build a brand, and stand out. You want to showcase that you understand the importance of this in making a company successful. If you've had any experience in contributing to marketing and advertising efforts before, discuss this also to further sell your ability to be successful with the company. A great fact to weave in is that according to an article on Contently.com, companies that invest at least 15% into advertising are more likely to see revenue growth of up to 20% year over year. Any facts or metrics you can research and include are great in helping to showcase your understanding.