The world wide web is a way to view and share information over the internet. This information can take the form of text, music, photos or videos or anything that is written on web pages and served up by a web browser.
In the process of creating the world wide web, Tim Berners-Lee also invented the URL (internet address), HTTP (which allows users to find a site) and HTML (the standard coding language for creating websites). The world wide has revolutionized, evolved and sped up the sharing and creation of information in what is seen as one of the most significant inventions since the printing press appeared in Europe in 15th Century Germany.
Check out this great explainer video on the how the world wide web works:
Right now, there are nearly 2bn websites in existence but most are hardly visited - in fact the top 0.1% of websites (roughly 5m) attract more than half of the world's web traffic including Google, YouTube, Facebook, Baidu, Instagram, Yahoo and Twitter.