<human>:  Where do most of the tech companies in Silicon Valley get their funding?
<bot>: Most tech companies in Silicon Valley get their funding from venture capitalists. Venture capitalists are investors who provide capital to startups in exchange for a share of the company. Venture capitalists usually invest in early-stage startups, which are companies that are just starting out and have not yet turned a profit. Venture capitalists are usually interested in investing in companies that have a high potential for growth and profitability.