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What is a daemon thread            Daemon threads are sometimes called "service" threads. These are threads that normally run at a low priority and provide a basic service to a program or programs when activity on a machine is reduced.           An example of a daemon thread that is continuously running is the garbage collector thread. This thread is provided by the JVM.

What is the difference between yield and sleeping When a task invokes yield(), it changes from running state to runnable state. When a task invokes sleep(), it changes from running state to waiting/sleeping state.