Andreessen Horowitz, also known as a16z, is a venture capital firm based in Menlo Park, California. Founded in 2009 by Marc Andreessen and Ben Horowitz, the firm has become one of the most influential investors in the technology sector. It backs companies at various stages, from seed to late-stage, across industries such as software, fintech, biotech, and crypto. Andreessen Horowitz is known for its deep network, operational expertise, and significant role in shaping Silicon Valley's startup ecosystem.