Emotional regulation is the ability to influence which emotions you have, when you have them, and how you experience and express them. Poor emotional regulation underlies a wide range of psychological problems including depression, anxiety, borderline personality disorder, substance abuse, and relationship difficulties. Meditation improves emotional regulation through multiple mechanisms: it increases the gap between stimulus and response (the pause in which a choice is possible), it reduces amygdala reactivity to emotional stimuli, and it increases prefrontal cortical control over emotional responses. The simple instruction 'notice your emotion without acting on it' is one of the most transformative skills meditation teaches.

Reference:

Wikipedia: Emotional Regulation

https://en.wikipedia.org/wiki/Emotional_self-regulation