Kernel Threads
Kernel threads are handled entirely by the kernel. They need not be associated with a process; a kernel can create them whenever it needs to perform a particular task. Kernel threads cannot execute in user mode. LWPs (in systems where they are a separate layer) bind to kernel threads and provide a user-level context. This includes a link to the shared resources of the process to which the LWP belongs. When an LWP is suspended, it needs to store its user-level registers until it resumes, and the underlying kernel thread must also store its own kernel-level registers.
Read more about this topic: Light-weight Process
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