ChatGPT is an advanced artificial intelligence (AI) chatbot developed by OpenAI that uses natural language processing to engage in humanlike conversations. It is built on the GPT (Generative Pre-trained Transformer) architecture, which enables it to understand and generate text based on patterns learned from extensive training on vast datasets such as books, websites, and other text sources. ChatGPT can perform a wide range of tasks including answering questions, writing articles, composing emails, generating computer code, summarizing content, and even creating art, making it a versatile tool in various domains. ChatGPT was launched in November 2022 and quickly became one of the fastest-growing software applications, reaching over 100 million users in just two months. It operates by predicting the next word or sentence in a sequence to generate coherent and contextually relevant responses, aided by reinforcement learning through human feedback to improve its reply quality over time. OpenAI has released multiple versions, with the latest being GPT-5, which enhances the chatbot's capabilities to understand more complex tasks, generate detailed responses, and even handle multimodal inputs like text, speech, and images. Users interact with ChatGPT via text prompts or, in some versions, audio and image inputs, and it can remember details from conversations to provide more fluid and personalized interactions. The chatbot's popularity stems from its ease of use, versatility, and ability to simulate natural, humanlike dialogue, although it can occasionally produce incorrect or nonsensical information, known as "hallucinations." It has revolutionized the AI field by showing how generative AI can assist in a multitude of professional and creative tasks, fundamentally changing how people access information and create content.