The investment income can be quite diversified as one can invest in a wide range of options. So you can have dividends from shares you bought, any accrued interest, and when you add everything up you will have the income generated from your various investments. It is recommended to be willing to diversify so that in case one investment is not doing that well, your investment income will be compensated from other investments in your portfolio.

Investment income refers to any type of financial benefit that an individual or legal entity obtains from any type of investment. To generate income, the investment must generate more income than the original assets.
Income can be expressed as:
Accrued interest
Dividends from shares
Option premiums
Other types of capital gains realized from any type of collateral

Investment income is cash that somebody acquires from an expansion in the worth of investments. It incorporates profits paid on stocks, capital increases got from property deals and interest brought in on a reserve funds or cash market account.