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What risk of a diversified portfolio can be specifically offset by options?
Options are contractual instruments. Most options you'll run into are contracts which allow you to buy or sell stock at a given price at some time in the future, if you feel like it (it gives you the option). These are Call and Put options, respectively (for buying the stock and selling the stock). If you have a lot of money in an index fund ETF, you may be able to protect your portfolio against a market decline by (e.g.) buying Put options against the ETF for a substantially lower price than the index fund currently trades at. If the market crashes and your fund falls in value significantly, you can exercise the options, selling the fund at the price that your option has specified (to the counter-party of your contract). This is the risk that the option mitigates against. Even if you don't have one particular fund with your investments, you could still buy a put option on a similar fund, and resell it to another person in lieu of exercise (they would be capable of buying the stock and performing the exercise themselves for profit if necessary). In general, if you are buying an option for safety, it should be an option either on something you own, or something whose price behavior will mimic something you own. You will note that options are linked to the price of stocks. Futures are contracts whose values are linked to the price of other things, typically commodities such as oil, gold, or orange juice. Their behaviors may diverge. With an option you can have a contractual guarantee on the exact investment you're trying to protect. (Additionally, many commodities' value may fall at the same time that stock investments fall: during economic contractions which reduce industrial activity, resulting in lower profits for firms and less demand for commodities.) You may also note that there are other structures that options may have - PUT options on index funds or similar instruments are probably most specifically relevant to your interests. The downside of protecting yourself with options is that it costs money to buy this option, and the option eventually expires, so you may lose money. Essentially, you are buying safety and risk-tolerance from the option contract's counterparty, and safety is not free. I cannot inform you what level of safety is appropriate for your portfolio's needs, but more safety is more expensive.