<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:  Describe the concept of multi-factor authentication in computer security. Context: Multi-factor authentication requires users to provide more than one form of verification to access data or systems. Answer: [/INST]It requires users to provide more than one form of verification to access data or systems.</s>