If a call option gives the holder the right to purchase the underlying at a set price before the contract expires, a put option gives the holder the right to sell the underlying at a set price. This is a preferred strategy for traders who:

• Are bearish on a particular stock, ETF, or index, but want to take on less risk than with a short-selling strategy
• Want to utilize leverage to take advantage of falling prices

A put option works effectively in the exact opposite direction from the way a call option does, with the put option gaining value as the price of the underlying decreases. Though short-selling also allows a trader to profit from falling prices, the risk with a short position is unlimited because there is theoretically no limit to how high a price can rise. With a put option, if the underlying ends up higher than the option's strike price, the option will simply expire worthless.

The trader's potential loss from a long call is limited to the premium paid. Potential profit is unlimited because the option payoff will increase along with the underlying asset price until expiration, and there is theoretically no limit to how high it can go.

Unlike the long call or long put, a covered call is a strategy that is overlaid onto an existing long position in the underlying asset. It is essentially an upside call that is sold in an amount that would cover that existing position size. In this way, the covered call writer collects the option premium as income, but also limits the upside potential of the underlying position. This is a preferred position for traders who:

• Expect no change or a slight increase in the underlying's price, collecting the full option premium
• Are willing to limit upside potential in exchange for some downside protection

A covered call strategy involves buying 100 shares of the underlying asset and selling a call option against those shares. When the trader sells the call, the option's premium is collected, thus lowering the cost basis on the shares and providing some downside protection. In return, by selling the option, the trader is agreeing to sell shares of the underlying at the option's strike price, thereby capping the trader's upside potential.

A protective put involves buying a downside put in an amount to cover an existing position in the underlying asset. In effect, this strategy puts a lower floor below which you cannot lose more. Of course, you will have to pay for the option's premium. In this way, it acts as a sort of insurance policy against losses. This is a preferred strategy for traders who own the underlying asset and want downside protection

Thus, a protective put is a long put, like the strategy we discussed above; however, the goal, as the name implies, is downside protection versus attempting to profit from a downside move. If a trader owns shares with a bullish sentiment in the long run but wants to protect against a decline in the short run, they may purchase a protective put.

If the price of the underlying increases and is above the put's strike price at maturity, the option expires worthless and the trader loses the premium but still has the benefit of the increased underlying price. On the other hand, if the underlying price decreases, the trader’s portfolio position loses value, but this loss is largely covered by the gain from the put option position. Hence, the position can effectively be thought of as an insurance strategy.