Religious Zionism (Tziyonut Datit) is an ideology that views Zionism as a fundamental component of Orthodox Judaism. Its adherents are also referred to as Dati Leumi (), and in Israel, they are most commonly known by the plural form of the first part of that term: Datiim (). The community is sometimes called 'Knitted kippah' (Kippah seruga), the typical head covering worn by male adherents to Religious Zionism.
Before the establishment of the State of Israel, most Religious Zionists were observant Jews who supported Zionist efforts to build a Jewish state in the Land of Israel. Religious Zionism revolves around three pillars: the Land of Israel, the People of Israel, and the Torah of Israel. The Hardal (Ḥaredi Le'umi) are a sub-community, stricter in its observance, and more statist in its politics. Those Religious Zionists who are less strict in their observance - although not necessarily more liberal in their politics - are informally referred to as "dati lite".
In 1862, German Orthodox Rabbi Zvi Hirsch Kalischer published his tractate Derishat Zion, positing that the salvation of the Jews, promised by the Prophets, can come about only by self-help. Rabbi Moshe Shmuel Glasner was another prominent rabbi who supported Zionism. The main ideologue of modern Religious Zionism was Rabbi Abraham Isaac Kook, who justified Zionism according to Jewish law, and urged young religious Jews to support efforts to settle the land, and the secular Labour Zionists to give more consideration to Judaism. Kook saw Zionism as a part of a divine scheme which would result in the resettlement of the Jewish people in its homeland. This would bring Geula ("salvation") to Jews, and then to the entire world. After world harmony is achieved by the re-foundation of the Jewish homeland, the Messiah will come. Although this has not yet happened, Kook emphasized that it would take time, and that the ultimate redemption happens in stages, often not apparent while happening. In 1924, when Kook became the Ashkenazi Chief Rabbi of Palestine, he tried to reconcile Zionism with Orthodox Judaism.