INTRANET: Intranet is a network of an organisation which cannot be opened all over the world.
INTERNET : It is the world wide web.
An interesting site
http://www.interviewcorner.com/Answer/Answers.aspx?QuestionId=267&MajorCategoryId=1&MinorCategoryId=1
HI,
Intranet uses TCP Channel with binary object, it is local to the application. Internet uses TCP or HTTP or SMTP protocols with heterogeneous applications.it is global to all applications.