Internet.

Nowadays, Internet is one of the most important inventions in the last century. Everybody usually uses it daily at works, at school to do homework...
We can download music, films...and speak with our friends, family a long distance and we can see them with the wepcam too. These are some of the many advantages that the internet has. Therefore it is very practical and if it didn't exist, probably our lifes would be different.
But internet isn't perfect. It has a lot of disadvantages such as having your personal data on the social networking and if you introduce your bank acount to buy something on the internet, someone may steal you.