These programs feature a section for teaching, informal quizzes and tests and/or a final exam.Depending on the software, tests may be multiple choice, true/false, fill-in-the-blanks, and sometimes even essay.For instance, distance education programs, driver's safety training and online test preparation courses are conducted over public connections, allowing users to log in from anywhere in the world around the clock.

According to a survey of 2,000 managers by Bersin and Associates, 60 percent reported using online training and another 57 percent used virtual classrooms and related training tools.­ Employers prefer online training because people can learn at their own pace.

Ever want to ask the teacher to repeat something, but you were too embarrassed to interrupt the class?

By clicking an "edit" button on an article, you are able to edit the article's text. What stops people from vandalizing a wiki until it dies?

You can add or change anything you like in the article you are reading. People assume that because anyone can edit a wiki at any time, the wiki must be flawed.

Ordering something over the Internet, whether it's a book, a CD or anything else from an online vendor, or signing up for an online account, requires entering in a good deal of sensitive personal information.

A typical transaction might include not only our names, e-mail addresses and physical address and phone number, but also passwords and personal identification numbers (PINs).

For example, The most famous wiki is called Wikipedia, a massive online encyclopedia.

Wikipedia has become so large (more than a million articles) that you run across it all the time in Google.

Closed networks require users to show up in person.