You might have heard that everything in this world has the other side, if one side is good, another side may be bad. Similarly, if one side is bad, another side will be good. This is the simple example, which may be applicable on the usage of internet.
Internet, no doubt has made this world so wonderful, which we had never even dreamt of. For example, I am writing this answer for a person, who is thousands of miles away from my place. It is only internet, which has made our life so comfortable and informative, you name any information, it is just a click away from you. For professionals and students, this new virtual world has become very useful, it is like a sea or information or a reference book, which is always on your fingertips.
As I mentioned, everything has the other side, internet too has the other side or negative side, which could badly spoil anyone especially children, who are exposed to many unwanted information like obscenity, sex, violence etc. They also get addicted to many things like online games, cartoons etc, which led to the deviation from studies and behavioral change.
At last, I would like to say that parent should always keep watch on their wards and must ensure that their child don't get exposed to unwanted content on internet, parents’ can also use the child lock or block the websites, which have the explicit content.
The advantages are: information, communication and creation. For example, there is a vast amount of info on the Internet which can be used both by children and adults alike. Everyone uses the Internet for e-mail or blog. And everyday lots of new creations such as websites and forums are created and people use them in accordance to the values of the other 2 advantages.
The disadvantages are: people can become addicted to the Internet. They will stay inside all day long and not