What is the 'Volatility Skew'
The volatility skew is the difference in implied volatility (IV) between outofthemoney options, atthemoney options and inthemoney options. Volatility skew, which is affected by sentiment and the supply and demand relationship, provides information on whether fund managers prefer to write calls or puts. It is also known as a "vertical skew."
BREAKING DOWN 'Volatility Skew'
A situation where atthemoney options have lower implied volatility than outofthemoney options is sometimes referred to as a volatility "smile" due to the shape it creates on a chart. In markets such as the equity markets, a skew occurs because money managers usually prefer to write calls over puts.
The volatility skew is represented graphically to demonstrate the IV of a particular set of options. Generally, the options used share the same expiration date and strike price, though at times only share the same strike price and not the same date. The graph is referred to as a volatility “smile” when the curve is more balanced or a volatility “smirk” if the curve is weighted to one side.
Volatility
Volatility represents a level of risk present within a particular investment. It relates directly to the underlying asset associated with the option and is derived from the options price. The IV cannot be directly analyzed. Instead, it functions as part of a formula used to predict the future direction of a particular underlying asset. As the IV goes up, the price of the associated asset goes down.
Strike Price
The strike price is the price specified within an option contract where the option may be exercised. When the contract is exercised, the call option buyer may buy the underlying asset or the put option buyer may sell the underlying asset.
Profits are derived depending on the difference between the strike price and the spot price. In the case of the call, it is determined by the amount in which the spot price exceeds the strike price. With the put, the opposite applies.
Reverse Skews and Forward Skews
Reverse skews occur when the IV is higher on lower options strikes. It is most commonly in use on index options or other longerterm options. This model seems to occur at times when investors have market concerns and buy puts to compensate for the perceived risks. Forward skew IV values go up at higher points in correlation with the strike price. This is best represented within the commodities market where a lack of supply can drive prices up. Examples of commodities often associated with forward skews include oil and agricultural items.

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What is the relationship between implied volatility and the volatility skew?
Learn what the relationship is between implied volatility and the volatility skew, and see how implied volatility impacts ... Read Answer >> 
How does implied volatility impact the pricing of options?
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How does the term 'in the money' describe the moneyness of an option?
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