Start-ups are businesses that have interesting products and services that are probably new in the market, thus, giving them an edge to grow very big in the future. Many start-ups offer innovative products and services but often lack capital to go into the market or start production. This creates an opportunity for investors. If you find something promising in a start-up, you can invest in their project, and gain equity in return. This way, you could soon become a part-owner of a profitable business.