Thread State

Runnable: A thread becomes ready to run, but does not necessarily start running immediately.
Running: The processor is actively executing the thread code.
Waiting: A thread is in a blocked state waiting for some external processing to finish.
Sleeping: The thread is forced to sleep.
Blocked on I/O: Waiting for an I/O operation to complete.
Blocked on Synchronization: Waiting to acquire a lock.
Dead: The thread has finished its execution.