Yeshiva is a Hebrew word referring to a institute for Orthodox Jewish education to males.
There are different types of yeshivos.
Depending on the community a yeshiva belongs to, the curriculum might include secular subjects on various levels, or it might not include any secular subjects at all. The latter variant of yeshiva study, in which only religious subjects are taught, is especially seen in the Hasidic world. The term 'yeshiva' is used in all groups belonging to Orthodox Judaism.
Yeshiva study often continues for a very large part of the day. Children as young as 8 might learn from 7 AM until 7 PM. Subjects studied include Torah, Halacha (Jewish law), Talmud, and various other Jewish subjects.
Girl's schools are named differently, traditionally a name beginning with "Beis ...", meaning "House of ....". The largest loosely affiliated network of girl's schools is referred to as "Beis Yaakov"; however, many Hasidic groups have differently named girl's schools, for example Beis Rochel for Satmar, Beis Rivkah for Chabad-Lubavitch and Bnos Leah Esther for Vizhnitz.