Web Traffic is the amount of data sent and received by visitors to a web site. Web traffic has been the largest portion of Internet traffic. Sites also often aim to increase their web traffic through addition on search engines and through search engine optimization.
Traffic is like money to a bank, if a bank doesn't have any money it's not really a bank and it is unable to operate without money. What is a website with no one visiting, you don't write a book just so you are the only person to read it.