ChatGPT is a variant of GPT (Generative Pre-trained Transformer), a type of language generation model developed by OpenAI. ChatGPT can make a real difference in various applications where generating human-like text is useful, such as conversation systems, content generation, language translation, and summarization. By using AI, ChatGPT can produce text that is more coherent and varied than what a rule-based system could generate, and it can do so at a much larger scale and faster speed than a human could.