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A pragmatic compromise. It takes the speed of a monolithic kernel but moves some non-critical services (like drivers or file systems) into user space. Many modern kernels are "monolithic with microkernel influence."
Hybrid kernels (like those in macOS and modern Windows) try to blend the speed of monolithic designs with the stability of microkernels. os kernel
The Kernel maintains a strict security barrier. It runs in Ring 0 (Supervisor Mode), the highest level of privilege, while applications run in Ring 3 (User Mode). If an application wants to access hardware, it must execute a "context switch," briefly handing control over to the Kernel. This prevents malicious software from easily hijacking your webcam or deleting your system files. A pragmatic compromise
In this design, all OS services run in the same memory space as the kernel. This makes the system very fast because there is no delay in communication. However, if one part of the kernel (like a buggy video driver) fails, the entire system crashes. Linux, macOS, and older versions of Windows. Microkernels The Kernel maintains a strict security barrier