Hi Dear 
 What is Kernel 
 The central module of an operating system
 kernel is responsible for memory management, process and task management, and disk 
 management.
 It is the part of the operating system that loads first, and it remains in main memory.
 Because it stays in memory, it is important for the kernel to be as small as possible while still 
 providing all the essential services required by other parts of the operating system and 
 applications.
 Regards 
 Linux User