Who are angel investors?

Angel investors are people who support start ups by funding them.Individuals who back emerging entrepreneurial ventures, usually as a bridge to get from the self-funded stage to the level of business that would both need and attract venture capital. Funding level ranges with the investors according to growth of the firm and it also ranges between hoe much equity the startup is willing to give for a certain amount.
An angel investor is an individual who provides capital for a business start-up, usually in exchange for convertible debt or ownership equity.