Silicon Valley refers to the Southern part of the San Fransico Bay Area. The term silicon valley represents all of the high-tech companies that manufacture and innovate silicon chips, but came to refer to all of the high-tech businesses in the area. Silicon Valley has had this name since the early twentieth century. Silicon Valley is the leading innovater of radio, television, and military electronics. Many companies that call Silicon Valley home are powerhouses such as Facebook, Youtube, eBay, and Apple Inc. Without Silicon Valley todays modern technologies may not have been invented making this place one of major importance.