Silicon Valley is a region in the southern part of the San Francisco Bay Area in Northern California that serves as a global center for high technology and innovation.
It corresponds roughly to the geographical Santa Clara Valley.
San Jose is Silicon Valley's largest city, the third - largest in California, and the tenth - largest in the United States; other major Silicon Valley cities include Sunnyvale, Santa Clara, Redwood City, Mountain View, Palo Alto, Menlo Park, and Cupertino.