Advertising agencies in effect work is by actually getting familiar with their clients' product or service in addition to identifying exactly which demographic would denote the best target audience for any promotion. For instance if a company sells funky skateboards, an ad agency would probably attempt to fix up the company's TV commercials when sports programs or teenagers programs are on air.
Remember that the very look and tone of any particular ad campaign would also be geared to suit the demographic. Creating, planning as well as handling advertising (and at times even other forms of promotion) is what advertising agencies do for their clients. Also, an ad agency is essentially independent from the client. An agency may also deal with overall marketing as well as branding strategies in addition to sales promotions for the client.
Keep in mind that there would be assorted prominent associations that a given advertising agency could belong to.
Remember that the very look and tone of any particular ad campaign would also be geared to suit the demographic. Creating, planning as well as handling advertising (and at times even other forms of promotion) is what advertising agencies do for their clients. Also, an ad agency is essentially independent from the client. An agency may also deal with overall marketing as well as branding strategies in addition to sales promotions for the client.
Keep in mind that there would be assorted prominent associations that a given advertising agency could belong to.