Silicon Valley

Short definition from Wiktionary

Proper noun

1. 1
   Originally, the region of the San Francisco Bay Area in which there were a high number of industries producing silicon chips; later extended to mean the entire concentration of high-tech businesses in this area.
2. 2
   The tech industry, especially the American tech industry specifically.
3. 3
   A tech industry cluster in another country, developed as a competitor to the original Silicon Valley.