Silicon Valley is located in the San Fransico Bay Area in California. Silicon Valley got its name for being a high technology producing area. Ralph Vaerst was an entrepreneur and thought of the name but Don Hoelfer first published it in the Electronic News newspaper. It has been known as Silicon Valley for 41 years. The importance of Silicon Valley lies in its production of technology. There are over 10,000 companies running in the area. All the companies provide many jobs for people. Silicon Valley is a trademark, a technology super-power, and a flourishing job market.
http://www.enterpriseirregulars.com/25271/silicon-valley%E2%80%99s-defining-characteristics/
http://en.wikipedia.org/wiki/Silicon_Valley