ChatGPT is an artificial intelligence model (specifically, a "great language model" or LLM) designed to process, learn and generate text in conversational fashion. It works by analyzing huge amounts of data written by humans to identify statistical patterns in the language, allowing it to make decisions about which word or phrase is most appropriate to answer you at any given time.

Its goal is simulate a smart human conversation: understand your question, remember the context of what you said before in the same conversation, and generate coherent, relevant and detailed answers.

Although he does not "think" or "feel" like a person, his results can be very similar because he has learned to imitate the structure and style of our language. It is, in essence, a machine for learning and deciding words, built to satisfy your need for information or conversation.