<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. Context: Multi-factor authentication requires users to provide multiple forms of verification before granting access to a system or account. Answer: [/INST]It requires users to provide multiple forms of verification before granting access to a system or account.</s>