STO stands for Security Token Offering. In fact, STO is an evolution of the ICO. Herewith, while ICOs are notable for little or no government regulation, STOs act as digital investment contracts combining ICOs’ Wild West versatility and reliability of traditional finance. If ICO fundraising model implies issuing utility tokens, which allow access to the company’s services and products, the basis of each STO is security token, which is an investment that eventually shares profits and pays interest and dividends to the token holders.