<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  What is the main purpose of using a VPN? Context: A VPN is used to ensure privacy and security through data encryption over the internet. Answer: [/INST]To ensure privacy and security by encrypting data transmitted over the internet.</s>