<p>An expiration date in the context of options trading is the final day on which an option can be exercised, or used to buy or sell the underlying asset at the agreed-upon price. This date is predetermined and is typically a few months to a year away from the date of the option's purchase.</p>

<h2>How It Works</h2>
<p>Options are derivatives, meaning their value is derived from the price of the underlying asset. The expiration date plays a crucial role in determining this value. As the expiration date approaches, the time value of the option decreases, and the price of the option converges towards the intrinsic value (the difference between the <a href="/NewSite/encyclopedia/strike-price/" class="ency-link">strike price</a> and the current price of the underlying asset). If the option is not exercised by the expiration date, it becomes worthless.</p>
<p>Here's a simple breakdown of how it works:</p>
<ul>
  <li>At the start, an option has both time value and intrinsic value.</li>
  <li>As the expiration date nears, the time value decreases, but the intrinsic value may increase or decrease based on the price movements of the underlying asset.</li>
  <li>On the expiration date, if the option is in the money (its intrinsic value is positive), it can be exercised. If it's out of the money (its intrinsic value is negative), it expires worthless.</li>
</ul>

<h2>Why It Matters</h2>
<p>The expiration date is a critical factor for options traders for several reasons:</p>
<strong>Risk Management:</strong> <p>Traders need to manage their options positions effectively, especially as the expiration date approaches. They may choose to close out their positions, roll them over to a later expiration date, or exercise their options if they're in the money.</p>
<strong>Premium Calculation:</strong> <p>The expiration date is a key input in the calculation of an option's premium. The further away the expiration date, the more time value the option has, and the higher its premium.</p>
<strong>Strategies and Tactics:</strong> <p>Traders use the expiration date in various strategies. For instance, in a covered call strategy, the trader sells call options with a certain expiration date to generate income, while also limiting their upside potential.</p>