detail about a kernel in Linux operating system.

1. The "kernel" is the core of the operating system. It is the base code. Other "features" of the OS are added to the kernel. Then application software is loaded on top of the OS and use the facilities of the OS (kernel and extensions) to provide access to system resources.
2. It is the heart the brain of the operating system.It controls the raw input and output functions,tcp/ip networking ,multitasking capability,memory management.
   It can be downloaded free from www.kernel.org although many vendors provide their own customized version of kernel.They use many functional modules for hardware device drivers,etc.
   These modules come in handy when adding new functionality as there is no need to recompile the kernel.
3. The central module of an operating system. 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. Typically, the kernel is responsible for memory management, process and task management, and disk management.

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