High-Tech Valley is a term used to refer to the Silicon Valley region of California, which is known for its high concentration of technology companies and startups. The term 'Silicon' in this context refers to the silicon chips used in computers and other electronic devices. Silicon Valley is home to some of the world's most successful tech companies, such as Apple, Google, and Facebook. It is also a hub for venture capital investment and has become a global center for innovation and entrepreneurship.