What is a thread group?

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A thread group represents a set of threads. Every Java thread is a member of a thread group. In addition, a thread group can also include other thread groups. Threads can only access the ThreadGroup to which they belong. Thread groups provide a mechanism for collecting multiple threads into a single object and manipulating those threads all at once, rather than individually. A tree structure can be formed from ThreadsGroups containing other ThreadGroups. 
Java provides the ThreadGroup class for creating and managing the thread groups. The ThreadGroup class provides two constructors :

ThreadGroup(String name)
ThreadGroup(ThreadGroup parent, String name)

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