The concept of simcha is an important one in Jewish philosophy. A popular teaching by Rabbi Nachman of Breslov, a 19th century Chassidic Rabbi, is "Mitzvah Gedolah Le'hiyot Besimcha Tamid," it is a great mitzvah (commandment) to always be in a state of happiness. When a person is happy they are much more capable of serving God and going about their daily activities than when depressed or upset.
Sometimes, the word "simcha" is also used as a name. It could be both a male or a female's name. In the Ashkenazi Jewish tradition, the name Simcha is most likely to be used for a boy, while in the Sephardic/Israeli tradition it would be a girl's name.
Jews often use simcha in its capacity as a Hebrew and Yiddish noun meaning festive occasion. The reason for it is that any celebration is a happy occasion. The term is used for any happy occasion, such as a wedding, Bar Mitzvah, Brit Milah or engagement.
Other expression includes: simcha music, which means: celebration music, usually wedding music.