Meaning
The classic red heart, the standard love symbol in emoji. It expresses love, deep affection, gratitude and support, and it can be romantic or entirely platonic depending on who sends it.
It fits almost any warm moment: “Thank you for everything today, Mom ❤️” Because it carries more weight than the colored or pink hearts, some people save it for partners and family, while others use it freely with friends. If an app shows the text version, it can appear as a plain black outline heart, which looks oddly somber.