Peer-to-peer lending (P2P) is a relatively new type of investment that lets people lend money without going through a typical financial institution, directly to other people or small businesses. You must first select a P2P platform and register for an account before you can invest in P2P lending. The next step is to look through the available loans and select those that fit your investing requirements. You can invest as little as $25 once you've decided which loan to take out. A percentage of the interest earned will be paid to you as the borrower makes payments. Diversifying your investment across a number of loans will help to reduce risk, as will thoroughly assessing the borrower's creditworthiness prior to making an investment.