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

Wikipedia has answers to most if not all of these questions.

http://en.wikipedia.org/wiki/Thread_(computer_science)

http://en.wikipedia.org/wiki/Thread_(computer_science)#Processes.2C_kernel_threads.2C_user_threads.2C_and_fibers