A temple is a building reserved for spiritual rituals and activities such as prayer and sacrifice. Many religions  currently or in the past have used temples.

The form and function of temples is thus very variable, though they are often considered by believers to be in some sense the "house" of one or more deities. Typically offerings of some sort are made to the deity, and other rituals enacted, and a special group of clergy maintain, and operate the temple. The degree to which the whole population of believers can access the building varies significantly; often parts or even the whole main building can only be accessed by the clergy. Temples typically have a main building and a larger precinct, which may contain many other buildings, or may be a dome shaped structure, much like an igloo.

Jewish Temple

In Judaism, the ancient Hebrew texts refer not to temples, the word having not existed yet, but to a "sanctuary", "palace" or "hall". Each of the two ancient temples in Jerusalem was called in the Tanakh Beit YHWH, which translates literally as "YHWH's House."

The Temple Mount in Jerusalem is the site where the First Temple of Solomon and the Second Temple were built. At the center of the structure was the Holy of Holies where only the High Priest could enter.

The Greek word synagogue came into use to describe Jewish (and Samaritan) places of worship during Hellenistic times and it, along with the Yiddish term shul, and the original Hebrew term Beit Knesset ("House of meeting") are the terms in most universal usage.

Since the 18th Century, Jews in Western and Central Europe began to apply the name "temple", borrowed from the French (where it was used to denote all non-Catholic prayer houses) to their synagogues. The term became strongly associated with Reform institutions, in some of which both congregants and outsiders associated it with the elimination of the prayers for the restoration of the Jerusalem Temple, though this was not the original meaning—traditional synagogues named themselves "temple" over a century before the advent of Reform, and many continued to do so after. In American parlance, "temple" is often synonymous with "synagogue".

 Mormon Temples

According to Latter Day Saints, in 1832, Joseph Smith received a revelation to restore the practice of temple worship, in a "house of the Lord". The Kirtland Temple was the first temple of the Latter-day Saint movement and the only one completed in Smith's lifetime, although the Nauvoo Temple was partially complete at the time of his death. The schisms stemming from a succession crisis have led to differing views about the role and use of temples between various groups with competing succession claims.  The primary Church of Jesus Christ of Latter-day Saints is a prolific builder of temples. There are 170 dedicated temples, 45 under construction, and 50 announced (not yet under construction), for a total of 265 Latter-day Saint temples are reserved for performing and undertaking only the most holy and sacred of covenants and special of ordinances. They are distinct from meeting houses and chapels where weekly worship services are held. The temples are built and kept under strict sacredness and are not to be defiled. Thus, strict rules apply for entrance, including church membership and regular attendance. During the open-house period after its construction and before its dedication, the temple is open to the public for tours.