This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
A daemon thread is a normal thread that does not force the JVM to remain running. Put another way, the JVM will shut down when all non-daemon threads are finished running, regardless of whether there are daemon threads still running or not.