Metta:

Metta is a term that refers to one of the 10 perfections of Buddhism and is the first of the four Buddhist virtues, or “immeasurables.” It can be translated as “benevolence,” “loving,” “friendship” or “kindness.” 

Metta means to care and wish well for another being without judging them, to accept them independently of agreeing or disagreeing with them, and without wanting anything from them in return. It is a universal love that can overcome all social, religious, ethnic, political and economic barriers. As a result of metta, one can experience another state of the four Buddhist virtues: joy, a true happiness in another’s happiness.