A hybrid kernel is a type of operating system kernel that combines elements of both microkernels and monolithic kernels. It aims to provide the performance benefits of a monolithic kernel, which runs most services in kernel space, while also incorporating the modularity and flexibility of a microkernel, which runs services in user space. This design allows for better resource management and easier updates. In a hybrid kernel, core functions like memory management and process scheduling are handled in kernel space, while additional services can run in user space. Examples of operating systems that use hybrid kernels include Windows and macOS. This approach helps balance efficiency and stability.