<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:  Provide an explanation of two-factor authentication. Context: Two-factor authentication adds an additional layer of security by requiring users to provide two forms of verification before accessing an account. Answer: [/INST]Two-factor authentication adds an additional layer of security by requiring users to provide two forms of verification before accessing an account.</s>