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A temporal gate in 2376.

A time portal[1], also known as temporal portal[2], temporal corridor[3], and temporal gate[4], was a portal for instantaneous movement from one point of the timestream or worldline to another. Traversing a temporal portal was a form of time travel. Temporal portals could be generated artificially, requiring advanced technology to accomplish. (ENT episode: "Stormfront"; STO - Future Proof mission: "The Temporal Front"; ST video game: Armada)

History and specifications

Created in ancient times, the Guardian of Forever on planet Rock of Ages was a sentient time portal. (TOS episode: "The City on the Edge of Forever")

In the 2370s decade, Starfleet encountered a time portal on Golana. (DS9 episode: "Time's Orphan")

The Federation Department of Temporal Investigations considered the abandoned, easily accessible time portals of the Golanans a threat to the temporal integrity of the prime universe timeline. (DTI novel: Watching the Clock)

USS Premonition opens a time portal.

In an alternate timeline where the Borg Collective had assimilated the majority of the Federation during the Borg Invasion of 2376, the Premonition-class prototype timeship USS Premonition traveled through time using temporal gates generated by its temporal drive. Captain Thaddius Deming used the temporal drive to alter the course of the invasion, leading to a Federation Alliance victory over Locutus of Borg. (ST video game: Armada)

A temporal facility.

In the 29th century, General Vosk and his Na'kuhl radicals had to construct a temporal facility to generate a temporal corridor. Vosk and his people used one such corridor in 2883 to travel to an alternate Earth in 1944. (STO - Future Proof mission: "The Temporal Front")

Once there, they used local technology to build another such facility in New York City. (ENT episode: "Storm Front")

From the 27th[5] to the 31st century, the Federation's Temporal Integrity Commission[6] and the Federation Temporal Agency[7] used temporal portals to move themselves, and other targets, through time and space. (ST performance: Star Trek Live, STO - Future Proof missions: "Time and Tide", "Vorgon Conclusions")