What is linux -- it is a kernel.
What is GNU\Linux -- linux operating system.
Linux is the name of the kernel. The kernel is the core part of an operating system that keeps track of everything. The kernel is both a fence and a gate. As a gate, it allows programs to access hardware in a uniform way. Without the kernel, you would have to write programs to deal with every device model ever made. The kernel handles all device-specific interactions so you don't have to. It also handles file access and interaction between processes.
The kernel also controls the flow of information between programs. The kernel is a program's gate to the world around it. Every time that data moves between processes, the kernel controls the messaging.
As a fence, the kernel prevents programs from accidentally overwriting each other's data and from accessing files and devices that they don't have permission to. It limits the amount of damage a poorly-written program can do to other running programs.
In our case, the kernel is Linux. Now, the kernel all by itself won't do anything. You can't even boot up a computer with just a kernel. Think of the kernel as the water pipes for a house. Without the pipes, the faucets won't work, but the pipes are pretty useless if there are no faucets. Together, the user applications (from the GNU project and other places) and the kernel (Linux) make up the entire operating system, GNU/Linux.
What is GNU\Linux -- linux operating system.
Linux is the name of the kernel. The kernel is the core part of an operating system that keeps track of everything. The kernel is both a fence and a gate. As a gate, it allows programs to access hardware in a uniform way. Without the kernel, you would have to write programs to deal with every device model ever made. The kernel handles all device-specific interactions so you don't have to. It also handles file access and interaction between processes.
The kernel also controls the flow of information between programs. The kernel is a program's gate to the world around it. Every time that data moves between processes, the kernel controls the messaging.
As a fence, the kernel prevents programs from accidentally overwriting each other's data and from accessing files and devices that they don't have permission to. It limits the amount of damage a poorly-written program can do to other running programs.
In our case, the kernel is Linux. Now, the kernel all by itself won't do anything. You can't even boot up a computer with just a kernel. Think of the kernel as the water pipes for a house. Without the pipes, the faucets won't work, but the pipes are pretty useless if there are no faucets. Together, the user applications (from the GNU project and other places) and the kernel (Linux) make up the entire operating system, GNU/Linux.
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