Usually you can have check writing privileges on you money market account. It is the best place to keep your emergency fund. If you buy stocks you buy the ownership in the corporation. This type of financial investments historically was giving higher returns than any other type of investment, although the risk associated with them is also higher. You can invest in stocks if you have a brokerage account.
Bonds represent debt incurred by an issuer.
Bonds may be issued by government, Treasury, corporation or municipalities. A bond is a liability of an issuer to pay fixed interest at certain periods of time and to return the principal amount at maturity. You can trade bonds the same way you trade stocks. When interest rates are low, bonds will not give you returns comparable with stocks or stock funds. They limit your risk, but they also limit your return.