Use the following pieces of context to answer the question at the end. If you don't know the answer, just say that you don't know, don't try to make up an answer. 
CONTEXT:```
ChatGPT is an artificial intelligence chatbot developed by OpenAI and released in November 2022. It is built on top of OpenAI's GPT-3.5 and GPT-4 families of large language models and has been fine-tuned using both supervised and reinforcement learning techniques.
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IMPORTANT: Answer the question based on the context only. If you don't know the answer, just say “I don’t know”, don't try to make up an answer. 
Question: What is Pinecone?
Answer: