Each operating system uses a kernel. Without a kernel, you can’t have an operating system that actually works. Windows, Mac OS X, and Linux all have kernels, and they’re all different. It’s the kernel that also does the grunt work of the operating system. Besides the kernel, there are a lot of applications that are bundled with the kernel to make the entire package something useful — more on that a bit later.
The kernel’s job is to talk to the hardware and software, and to manage the system’s resources as best as possible. It talks to the hardware via the drivers that are included in the kernel (or additionally installed later on in the form of a kernel module). This way, when an application wants to do something (say change the volume setting of the speakers), it can just submit that request to the kernel, and the kernel can use the driver it has for the speakers to actually change the volume.
The kernel is highly involved in resource management. It has to make sure that there is enough memory available for an application to run, as well as to place an application in the right location in memory. It tries to optimize the usage of the processor so that it can complete tasks as quickly as possible. It also aims to avoid deadlocks, which are problems that completely halt the system when one application needs a resource that another application is using. It’s a fairly complicated circus act to coordinate all of those things, but it needs to be done and that’s what the kernel is for.
What Else Makes Up An Operating System?
Like I mentioned earlier, operating systems include their own kernel along with a bunch of other applications. With just a kernel, it’s nearly impossible to do anything with the operating system. You also need some other applications to be bundled with it, such as a shell. The shell is responsible for displaying the prompt that you see in terminals or command lines. Shells are a much easier way to launch applications, navigate through folders, and much more. All of those tasks that you can do in a shell are supported via other applications that must be bundled as well. For example, the tar application is needed if you’re working with tarballs in a shell.