Informal style is often characterized by the following:
* The use of contractions, such as "I'm" instead of "I am" and "don't" instead of "do not."
* The use of slang and colloquialisms, such as "cool," "awesome," and "OMG."
* A more personal and conversational tone, which may include the use of personal anecdotes, opinions, and humor.
* Less formal grammar and punctuation, such as the use of sentence fragments and run-on sentences.
Informal style is not necessarily considered "incorrect" or "bad" writing, but it is important to use it appropriately. For example, informal style would not be appropriate for a formal essay or a business letter. However, it can be an effective way to communicate in personal and creative writing, as it can help to create a more relaxed and engaging tone.