What is the most important aspect of marketing?

The Most important aspect of Marketing is we need to understand benefits of Branding, Consistency key to successful branding & Market research.Need to understand benefits of branding.Despite the fact that branding is absolutely imperative for the business like small and medium enterprises (SMEs), we still seem to be unaware of the advantages that corporate branding has to offer.
It is indeed sad that only a handful of marketers today believe in the brand-building process and most companies do not perceive the benefits in transforming their businesses into strong, clear and differentiated brands.What most Marketers fail to see is that branding can bring in new business, exclusive clients, and an opportunity to eventually garner higher revenues and thus ensure long-term profitability?.I believe that intelligent branding serves to create confidence not only in one's business, but also in one's products and service offerings.
Which means that this confidence impacts not only the Marketers and his employees, but most importantly, the customers too?

customer focus

Market Research

understanding your target market 

Promotion i think then ads