A 'Pre-sale' the phase of an ICO before the 'Public-sale'. During this phase, investors can make the first investment. The tokens often have a lower price than during the public sale. The money raised is generally used for further development, financing of the public sale and as a method to explore the market's enthusiasm. It is possible that the ICO itself is not successful and a 'refund' is not always guaranteed. This also makes a pre-sale riskier than a public sale.