Joy

A pleasant emotion that emerges when one’s current circumstances present unexpected good fortune. People feel joy, for instance, when receiving good news or a pleasant surprise. Contrasted from serenity. See also Joy of Missing Out.

Reference:

Fredrickson, B. L. (2013). Positive emotions broaden and build. Advances in experimental social psychology, 47(1), 1-53. https://doi.org/10.1016/B978-0-12-407236-7.00001-2