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The difference between a informal and formal speech is the language used. In a formal speech they would sound mature and not use slang. Slang words are words that are informal or typically inappropriate, such as "ain't" or "wassup". In a formal speech these words wouldn't be used. While in an informal speech they would. They would use slang words and inappropriate words which are not needed.

The major differences between formal and informal speech come from the social and cultural contexts in which speakers use them. Speakers tend to use informal English among friends and relatives. Informal speech can include informal text messages and other written communication. Speakers use formal speech in more professional settings, usually among colleagues or new acquaintances. Judgment of comfort level and social expectations give clues to speakers so that the average person switches between formal and informal speech in a variety of situations.