Angel investors seek to invest at the early stages of startups. These types of investments are risky and usually do not represent more than 10% of the angel investor's portfolio. Most angel investors have excess funds available and are looking for a higher rate of return than those provided by traditional investment opportunities.

Angel investors provide more favourable terms compared to other lenders, since they usually invest in the entrepreneur starting the business rather than the viability of the business. Angel investors are focused on helping startups take their first steps, rather than the possible profit they may get from the business. Essentially, angel investors are the opposite of venture capitalists.

Angel investors are also called informal investors, angel funders, private investors, seed investors or business angels. These are individuals, normally affluent, who inject capital for startups in exchange for ownership equity or convertible debt. Some angel investors invest through crowdfunding platforms online or build angel investor networks to pool capital together.