ChatGPT is a large language model chatbot created by OpenAI that can engage in human-like conversations, generate various text formats, and assist with a wide range of tasks. It uses natural language processing (NLP) and deep learning to understand and respond to user queries. 

Here's a more detailed look:

Key Features:

1. Natural Language Processing:

   ChatGPT can understand and respond to questions and requests in a natural, conversational way according to OpenAI. 

2. Text Generation:

   It can generate various written content, including articles, essays, code, emails, and more according to TechTarget. 

3. Conversation:

   ChatGPT can engage in multi-turn conversations, remembering the context of previous interactions. 

4. Human-like Responses:

   It is trained on vast amounts of text data, allowing it to produce responses that are often indistinguishable from human-written text according to OpenAI. 

5. Reinforcement Learning with Human Feedback:

   ChatGPT's responses are further refined through reinforcement learning, using human feedback to improve its performance according to OpenAI.