ChatGPT (Chat Generative Pre-trained Transformer) is a large language model-based chatbot developed by OpenAI and launched on November 30, 2022, that enables users to refine and steer a conversation towards a desired length, format, style, level of detail, and language. Successive prompts and replies, known as prompt engineering, are considered at each conversation stage as a context.

ChatGPT is a form of generative AI -- a tool that lets users enter prompts to receive humanlike images, text or videos that are created by AI. ChatGPT is similar to the automated chat services found on customer service websites, as people can ask it questions or request clarification to ChatGPT's replies.

The app was initially rolled out in the US; however, its maker, OpenAI, has expanded its availability, including in India.      ChatGPT originally used the GPT-3 large language model, a neural network machine learning model and the third generation of Generative Pre-trained Transformer. The transformer pulls from a significant amount of data to formulate a respons.

ChatGPT now uses the GPT-3.5 model that includes a fine-tuning process  its algorithm. ChatGPT Plus uses GPT-4, which offers a faster response time and internet plugins. GPT-4 can also handle more complex tasks compared with previous models, such as describing photos, generating captions for images and creating more detailed responses up to 25,000 words.

ChatGPT uses deep learning, a subset of machine learning, to produce humanlike text through transformer neural networks. The transformer predicts text -- including the next word, sentence or paragraph -- based on its training data's typical sequence.

Who is the founder of ChatGPT?

Sam Altman is a prominent entrepreneur and investor in the field of technology and startups. He's known for his contributions to the tech industry and his involvement with several influential companies and organizations.

Altman started his entrepreneurial journey at a young age. In 2005, while still a student at Stanford University, he co-founded Loopt, a location-based social networking mobile app. Loopt was one of the early location-based services.

Altman is also an active investor in various tech startups. He has invested in and advised numerous companies, further contributing to the growth of the tech ecosystem. Altman has also been involved in educational initiatives, including teaching courses on startups and entrepreneurship at Stanford University.

Sam Altman is recognized for his deep involvement in the tech and startup communities, his leadership in AI research, and his efforts to address the societal implications of technological advancements.