We communicate with each other. We also communicate on our side and try to believe that we have been understood on the other side as well. Many of us also think that they have also abilities in this sense. We cannot perceive thinking that we have said someting the other maybe understood the contrary of what we intended to say.
It is particularly important to know which kind of marketing instruments you need to use. In the following classification you will gain some hints no matter if your interest is entrepreneurship, sales or advertising activities. So you can just pick out what you consider interesting for your field of activity.