Seed capital is investment contributed at a very early stage of a new venture, usually in relatively small amounts. It comes even before what they call “first round” venture capital.
How much is that “relatively small amount?” Some high-end high-tech ventures in the heart of Silicon Valley call an investment of $500K seed capital, and other ventures that called $35K investment seed capital, and the following $300K investment the first round. It depends on the point of view.
For more on venture capital, check out our resources on venture capital and angel investment.