A put option in which an investor writes a put contract and then deposits into the broker's account an amount equal to the put's strike price, in an event the option is exercised. The money deposited acts as a guarantee to the broker that the investor will be able to meet the conditions of the contract. Meanwhile, the deposit may be invested in short-term investment to yield interest.

Related information about cash-secured put:

1. Cash-Secured Put
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3. Cash-Secured Put | Trading Put Options - The Options Playbook
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5. Cash-Secured Put - TradeKing
   How to write a cash-secured put. Get detailed strategy tips, setup guides and examples for trading cash-secured put options.
    
6. Cash Secured Put - Ise.com
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7. Selling / Writing Cash Secured Put Options & Covered Calls ...
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