What is the difference between kernel threads and user threads?

Question

What is the difference between kernel threads and user threads? Is it that kernel thread are scheduled and executed in kernel mode? What are techniques used for creating kernel

Answer 1

Essentially user threads run in the context of a user with the appropriate privilege levels e.g. user threads most certainly won't have access to kernel-level memory/data structures/routines etc. Whereas Kernel threads run in the context of the OS kernel thus giving them privileges to execute code which has access to low level kernel routines/memory/data structures.