Martin Luther king Jr gave a speech which was named as "I have a dream". This speech had a great impact on the audiences who listened to the speech. Martin was able to emotionally appeal the audience by repeatedly using the phrases like "I believe" and "I have a dream".
The speech was about to make the people aware about the economic rights and about the equality. In the speech given by him, he called for an end to the problem of racism in the United States of America.
Depending on the audience, the formality, ideas presented, and vocabulary can change. For example, if you were presenting to children, you wouldn't use complex words.
