Bonds

You know how you take a loan from the bank and pay them interest. With a bond you loan money to the government or a company. 

3 types:

Cooperate: Loan to Company

Municipal: Loan to State

Treasury: Loan to Government 

You get interest every 6 months and your money is locked in. Cooperate has highest rate of risk and interest but treasury is more safe. Now stocks are mostly better but for money that you want to save for longtime it is good. Although HYSA is better for emergency.