The HEART-GSM Framework, standing for Goals-Signals-Metrics, is a structured approach used to assess and enhance user experience in digital products. It helps teams identify specific goals (Happiness, Engagement, Adoption, Retention, Task Success), detect signals indicating user behavior related to these goals, and define metrics to quantitatively measure these signals. This framework is beneficial for its focus on user-centric metrics, making it a powerful tool for improving product design and user satisfaction.