What do you think a good speaker should have in order to convince people to agree to his/her idea?

Hye frenz..this was the topic i choose.a Good Speaker..

A good speaker is come from a good person who had a talent and interaction to give a speech to the audiences in the meeting such as parliament. The speaker also must have their own spirit and assured self to in front of audience and make audience understand also agree with the speech. Speaker should have to give an impact to the audience to make sure the audience believe and bring something if speaker finish their speech.