Kernel

OS VS Kernel

Kernel	OS
It is considered a central component of OS	It is considered system software.
It simply acts as an interface between hardware and applications.	It simply acts as an interface between hardware and user.
It is generally responsible for converting user commands into machine-level commands.	It is generally responsible for managing the resources of system.
It also performs functions like process management, file management, device management, I/O communication, etc.	It also performs functions like providing security to data and files in the the system, providing access controls to users, maintaining the system privacy, etc.

MicroKernel	Monolithic Kernel
Kernel services and user services are present in different address spaces.	Kernel services and user services are usually present in the same address space.
It is smaller in size.	It is larger in size.
It is easily extendible.	It is hard to extend.
It uses message queues to achieve inter-process communication.	It uses signals and sockets to achieve inter-process communication.