Why phenolphthalein indicator used in titration?

Phenolphthalein is commonly used as an indicator in acid-base titrations because it changes color sharply within a specific pH range (approximately 8.2 to 10). In an acid-base titration, the endpoint is reached when the solution becomes either pink (indicating a basic solution) or colorless (indicating an acidic solution), making it easy to detect the completion of the reaction.