An area on a computer network especially the Internet, devoted to the discussion of a specified topic is known as Newsgroup. It is an online discussion group that allow interaction through electronic bulletin board system (Usenet) and chat sessions.
To simplify the selection of suitable newsgroup, they are divided into subject classification which are as follow:
● rec- Recreation and entertainment topics.
● news- Matter related to the functionality of Usenet itself.
● sci- Science related topics.
● soc- Discussion related to society and social subcultures.
● comp- Computer related topics.
A newsgroup is a worldwide platform for exchanging its content, ideas and information by common minded people. Newsgroup and contents are stored on special servers called Network News Transfer Protocol (NTTP) servers. The groups can be either "moderated" where a person or group decides which posting will become part of the discussion or "unmoderated" where everything posted is included in the discussion.
e.g. alt.tennis, alt.astrology, comp.lang.C + + etc.