<p>Greeks, in the context of options trading, are risk measures used to quantify how sensitive an option's price is to changes in various underlying factors. They are named after the Greek letters that represent them and are crucial for managing and pricing options. The five main Greeks are <a href="/NewSite/encyclopedia/delta/" class="ency-link">Delta</a>, <a href="/NewSite/encyclopedia/gamma/" class="ency-link">Gamma</a>, <a href="/NewSite/encyclopedia/theta/" class="ency-link">Theta</a>, <a href="/NewSite/encyclopedia/vega/" class="ency-link">Vega</a>, and Rho.</p>

<h2>How It Works</h2>
<p><strong>Delta</strong> measures the change in an option's price for a $1 change in the price of the underlying asset. It ranges from 0 to 1 for calls and 0 to -1 for puts, and is a key metric for managing option portfolios.</p>
<p><strong>Gamma</strong> quantifies the rate of change of Delta. It indicates how much Delta will change for a $1 move in the underlying asset's price. Gamma is highest for at-the-money options and decreases as options move in or out of the money.</p>
<p><strong>Theta</strong> represents the rate of decay of an option's price over time, all else being equal. It indicates how much an option's price will decrease due to the passage of time, assuming no other factors change.</p>
<p><strong>Vega</strong> measures the change in an option's price for a 1% change in implied volatility. It indicates how sensitive an option's price is to changes in volatility, with out-of-the-money options typically having higher Vega.</p>
<p><strong>Rho</strong> quantifies the change in an option's price for a 1% change in interest rates. It is typically low for short-term options and increases as the time to expiration lengthens.</p>

<h2>Why It Matters</h2>
<p>Understanding and managing Greeks is vital for options traders to control risk and maximize profits. By monitoring Greeks, traders can:</p>
<ul>
  <li>Assess the potential impact of price movements in the underlying asset on their options portfolio (Delta).</li>
  <li>Anticipate changes in Delta as the underlying asset's price moves (Gamma).</li>
  <li>Account for the time decay of options (Theta).</li>
  <li>Evaluate the sensitivity of options to changes in implied volatility (Vega).</li>
  <li>Consider the impact of interest rate changes on options (Rho).</li>
</ul>
<p>Effective management of Greeks enables traders to make informed decisions, hedge their portfolios, and optimize their trading strategies.</p>