Mortgage REITs, like Annaly Capital Management, are often grabbing investors' attention because of their big dividends, but what do these companies actually do?

In this segment of The Motley Fool's everything-financial show, Where the Money Is, analysts David Hanson and Matt Koppenheffer take a question from their mailbag from a viewer requesting an "Idiot's Guide to Annaly Capital Management."

David Hanson owns shares of Annaly Capital Management. Matt Koppenheffer has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.