Silicon Alley, centered in Manhattan, has evolved into a metonym for the sphere encompassing the New York City metropolitan region's high tech industries. It includes the Internet, new media, telecommunications, digital media, software development, biotechnology, game design, financial technology (fintech), and other fields within information technology that are supported by the area's entrepreneurship ecosystem and venture capital investments. As of 2014, New York City hosted 300,000 employees in the tech sector.

In 2015, Silicon Alley generated over US$7.3 billion in venture capital investment, most based in Manhattan, as well as in Brooklyn, Queens, and elsewhere in the region. High technology startup companies and employment are growing in New York City and across the metropolitan region. Bolstered by the city's emergence as a global node of creativity and entrepreneurship, social tolerance, and environmental sustainability, as well as New York's position as the leading Internet hub and telecommunications center in North America.

More Info: en.wikipedia.org