The easy answer is that you are the best person for the job -- but the employer is looking for more than that. They usually want you to provide a detailed explanation of your basic skills, and how you plan to apply them to the position for the benefit of the company. They want you to do it without hesitating or grasping for words, and they want it to make sense. In other words, you have to know exactly what you are going to say in advance.
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