Operating systems have two primary domains: userspace and kernelspace, which provide access to system resources and security. Userspace is a limited-authority domain where applications run. Kernelspace, on the other hand, is a more privileged domain with direct access to hardware and system resources. The differences between these two domains are critical for security, performance, and system stability. This blog post examines the definitions, characteristics, differences, and relationships of these two domains in detail. It also touches on topics such as security measures, performance optimization, and current trends. A proper understanding of these two domains in operating systems ensures more efficient and secure systems. In Operating Systems...