<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 two-factor authentication? Context: Two-factor authentication adds an extra layer of security by requiring two different forms of identification. Answer: [/INST]Two-factor authentication is a security process that requires two different forms of identification in order to access an account.</s>