<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 role of access control in computer security. Context: Access control in computer security involves mechanisms that restrict access to resources and information, ensuring only authorized users have access and protecting sensitive data. Answer: [/INST]Access control mechanisms ensure that only authorized users have access to resources and information, preventing unauthorized access and protecting sensitive data.</s>