Startups need money to get off the ground, often more than founders can provide themselves. Before large venture capital firms get involved, a special type of investor steps in. These are angel investors.

Unlike banks or venture capital funds, angel investors are typically wealthy individuals who invest their own money. They fill a critical funding gap between the initial money from friends and family and the larger investments from formal institutions. They provide the "seed" capital that helps a promising idea begin to grow into a real business.

Who are these investors? Many are successful entrepreneurs or former executives who have deep industry experience. They've built companies before and want to help the next generation succeed. While the potential for a large financial return is a major motivator, it's often not the only one. Many angels are passionate about innovation and enjoy the process of mentoring new founders. They provide more than just cash; they offer guidance, strategic advice, and access to their personal networks.

This hands-on approach is what distinguishes many angel investors. They aren't just passive check-writers. They are often active participants in the company's early life, serving as a sounding board for the founders and helping them navigate the challenges of building a business from scratch.

Angel investing is not for the faint of heart. The risks are substantial. Most startups fail, meaning an angel investor must be prepared to lose their entire investment. Unlike public stocks, shares in a private startup are illiquid. You can't just sell them on an exchange. It might take many years, if ever, to see a return.

The rewards, however, can be immense. If a startup succeeds and is acquired or goes public, the return on an early investment can be enormous, sometimes 10, 50, or even 100 times the initial amount. This potential for outsized returns is what compensates for the high risk. Beyond the financial upside, there's the satisfaction of helping to build a successful company and bringing a new idea to life.

Because of the high risks involved, investing in private companies is regulated. In the United States, most angel investors must be "accredited investors." This is a legal designation defined by the Securities and Exchange Commission (SEC).

Generally, this means an individual must have an annual income over $200,000 (or $300,000 with a spouse) or a net worth of over $1 million, not including their primary residence. These rules are in place to ensure that investors can afford the potential loss of their investment.

Investments themselves are made through specific legal agreements. Early-stage deals often use structures like a SAFE (Simple Agreement for Future Equity) or a convertible note. These allow the startup to take in money now and figure out the company's valuation later, during a larger funding round. In other cases, investors buy equity directly, receiving a specific number of shares at an agreed-upon price.