Advantages


Communication: 
It is much easier and faster to communicate through the internet.

Information
Information is easy to find. It is very helpfull when it comes to research for homework and projects.

Entertainment
If you come across boredum, a funny internet video can help you take a laugh but, not only that, there are games, stories, interesting stuff, etc., one can find loads of content to keep intertained or keep doing something.
Services
Many services are up for use on the web. One can now purchase, make transactions and much more.

E-Commerce
You can use publicity to your advantage for example selling or giving services.

Disadvantages

Theft of Personal information
There are many hackers on the internet who are looking to steal information whether it be identity theft or accounts anything stolen is always bad for one.

Spamming: 
Unwanted emails, false advertisement.

Virus threat
Viruses can harm your computer camking you throw away hundreds of had earned cash in the trash.

based on the info from-http://www.answers.com/Q/What_are_the_advantages_and_disadvantages_of_internet

Video-

https://www.youtube.com/watch?v=qxVrQ0dtubs