Today is the time of communication. Every one is communicating with one another. Have you ever got what you wanted just by pronouncing words? Communication is great skill, which you can learn and practice it and become an expert. Convince people to give you the job that you want. I you are a sales person convince customers to buy what ever you want them to buy. May be you are just that kind of a person that always wants to be right, want to stand out, prove your point to people around.You don't have to be natural in it. Don't think that people are born with the skill of convincing other people, they learn the skill and you can learn it too.