Here's why this is important:

* Equivalence Point: The equivalence point is the point in a titration where the moles of acid and base are exactly equal. This is theoretically a neutral pH (pH 7) for a strong acid-strong base titration.

* End Point: The end point is the point in a titration where the indicator changes color.

* Choosing the Right Indicator: You want the end point to be as close to the equivalence point as possible for accurate results. Phenolphthalein is a good choice for strong acid-strong base titrations because its color change range is close to the pH 7 equivalence point.

Important Note: While phenolphthalein is a common indicator for strong acid-strong base titrations, its color change range doesn't perfectly align with the pH 7 equivalence point. In some cases, you might use a different indicator for more precise results.