Just as Email Marketing helps in categorizing the target audiences, clients and potential customers, it is more efficient and less time consuming when it comes to listing out specialty data. Targeting a particular audience is one side of a coin while initiating a relationship with each is another. An organization may target a huge audience let's say based on age or gender, it is further more essential and fundamental to market your product to them. For instance, a music CD is marketing differently to different ages of people. In fact, different genres of music are marketed differently to different ages of people. Just as we cannot market or sell Death Metal music to senior citizens, similarly, it is rather senseless to sell something that is irrelevant to the target audience in the market. The primary point being that maybe if targeting audiences were made easier by categorizing them, marketing products and services is also one step easier.