ChatPDF is an amalgamation of the ChatGPT product from OpenAI which acts like a chatbot based on GPT technology. GPT stands for Generative Pre-trained Transformer. It is a type of Large Language Model, or LLM. Many companies, including Instabase leverage GPT models as part of their products. GPT models are pre-trained on billions of input data, and are used to help understand language in a similar way humans would. PDF, or Portable Document Format, is a popular digital document type. The idea of using chatbot technology leveraging GPT models with PDF documents refers to being able of talking with a PDF document in a similar way a human would. Advanced companies like Instabase use these concepts to intelligently extract relevant information from documents at high speed or even perform higher level actions such as comparison or summarization.