What are the advantages and disadvantages of web-based training?

"5. Web-based training is popular at many companies as a way to bring a wider variety of courses to more people at lower costs. The Web-Based Training Information Center site at http://www.webbasedtraining.com provides a good introduction. Learn about the basics of online training at its Primer page. Then link to the Resources section, try a demo, and explore other areas that interest you. Prepare a brief report on your findings, including the pros and cons of using the web for training, to present to your class."