Internet

Internet the most userful things and one of the best inventions in the world. Because with interent you can made all. You can communicate with people from different countryes, buy, have a good time, play, work. Exist some servises like:iTunes, ebay, aliexpres, google. 

Also internet help for studing. You may use something sourses where you can take information for your work (essay, report and ect.). But parth of students can take answer in control work.