Venture Capital firms such as Accel and Greylock Partners are the main investors in start-up companies. They provide funding for business who typically have some kind of technological innovation, but lack large amounts of capital. Whether they are a "high tech" company or a more traditional service provider, the decision to fund an idea is taken seriously by VC firms. Most start-up companies have to go through multiple rounds of interviews with VC partners before they can be considered for funding by these firms. This process is usually completed over several weeks or months before investments are made, so if you're thinking about starting your own business, expect to spend time preparing for your application and getting yourself across as a viable candidate if you want success.