The IRS loves 1099 forms because they give the tax agency an inside look at your finances. Just as employers are required to report how much salary you are paid on a W-2 form, many others who make payments of taxable income are required to use a 1099 to tell the IRS who got how much. The taxpayers themselves get copies of the forms.
The 1099-INT shows taxable interest you earned. The 1099-DIV shows dividends you earned on stocks and from mutual funds that invest in them. The 1099-B shows the proceeds from trades at your brokerage firm or redemptions of mutual fund shares. The 1099-R shows retirement plan payouts. And the 1099-Misc shows many different things: the value of prizes won on a game show; rents paid for office space; crop insurance payments; fees and commissions paid to independent contractors; and on and on.
If you received any 1099-Misc forms, go through the Miscellaneous Income interview.