<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 two-factor authentication in computer security. Context: Two-factor authentication adds an extra layer of security by requiring users to provide two forms of identification to access their accounts in computer security. Answer: [/INST]Two-factor authentication adds an extra layer of security by requiring users to provide two forms of identification to access their accounts.</s>