ChatGPT is a Large Language Model AI. That is to say that it is an AI that was trained using a large database on content available on the internet. It create replies by predicting the next token.

Some prompts are very useful to improve the output of ChatGPT:

When an AI output text, it tends to write sentences of a more uniform style. That is to say that sentences length and complexity tend to be more uniform throughout a text compared to human output. To input more natural outputs, it may be useful to increase the complexity of burstiness. An example of this can be achieved using this prompt:

When it comes to writing content, two factors are crucial, “perplexity” and “burstiness.”Perplexity measures the complexity of text. Separately, burstiness compares the variations of sentences. Humans tend to write with greater burstiness, for example, with some longer or complex sentences alongside shorter ones. AI sentences tend to be more uniform. Therefore, when writing the following content I am going to ask you to create, I need it to have a good amount of perplexity and burstiness. Do you understand?

Source: https://youtu.be/Xgc-d7SO4OQ