I would say man's greatest invention is the world wide web. It was invented by Sir Tim Berners- Lee , an English Engineer in 1990. Thus started an internet revolution in which we are living now. It is a system of interlinked hyper-text documents which can be accessed through the internet. WWW means the websites and their billions of webpages that we access each day. This invention has helped mankind to reach a person anywhere in the world within seconds. Any information can also be searched and made available from any part of the world. This is a great blessing which was never heard of before this invention. It was very difficult to obtain an information or reach a person in older times. The internet as well as the world wide web can be listed as the best invention by man in modern times, since it serves to make use of time most effectively in this fast moving world.