What is Marketing?

Heidi Cohen compiled 72 different answers to this question from various marketing practitioners and agencies. My definition is listed at #68 (thankfully, the answers aren’t “ranked”, the responses are listed alphabetically by last name, so you have to scroll down). Here it is again:

Marketing, in general, is the communication of information about a product or service to an audience. Effective marketing is a two-way communication that combines both art and science. It is a discipline with no end game that must be constantly honed, tweaked, and tested. Effective marketing builds relationships and inspires trust; it is not “push” or “pull”. The key to effective marketing is getting the communication mix correct for your brand, product or service, understanding how it best interacts with customers or users in the most conducive and accepting environment.

What are your thoughts? What am I missing?