A message and the replies to it for a discussion thread. All Usenet newsgroup messages that are not replies to other messages are new threads. A thread is the most common way to distinct particular messages from a post to track the community responses to the topic. A thread is an array of multiple posts on the same subject matter of the original posts. A thread is commonly distinguished by the RE: subject name in order to filter the messages that correspond to the original message that was posted on a particular newsgroup, or an array of Usenet newsgroups that handle the same subject matters in a variety of deviations.