The kernel is a program that constitutes the central core of a computer operating system. It has complete control over everything that occurs in the system.
kernel is the heart of operating system which manages and maintains operations of computer hardware.A kernel is the central part of an operating system. It manages the operations of the computer and the hardware - most notably memory and CPU time. There are two types of kernels: A microkernel, which only contains basic functionality; A monolithic kernel, which contains many device drivers.
The kernel is the program that acts as a middle layer between software and hardware. When a program requires access to certain resources or processing power, the kernel is responsible for sending the correct signals to the CPU and managing all other running programs and services so that the resources are correctly allocated and no conflicts occur.