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A wormhole was a passage which linked two separate points in space-time, usually serving as a shortcut between those two points allowing two distant points to be drawn together closer. Wormholes could also form between universes in the same multiverse.
Wormholes would disintegrate organic matter. The only way to survive a journey through the wormhole was with a metal shield enclosing the occupants, acting as a Faraday cage. They could also be used as two-way travel. (TV: Planet of the Dead)
When told of the lie of the Timeless Child by the Spy Master, the Thirteenth Doctor received a vision of the child stood beneath a wormhole next to a monument on an unknown planet. (TV: Spyfall) She would later receive the same vision at the hands of Zellin, albeit this time she herself featured in the vision, watching the child from afar. (TV: Can You Hear Me?) Later the Master explained to the Doctor that these were repressed memories buried deep within all Time Lords, which stemmed from the Doctor's own history as the Timeless Child and the experiments performed on them by the First Tecteun in order to crack the regeneration code and give the Shobogans the ability to regenerate. (TV: The Timeless Children) Tecteun further clarified to the Doctor that the wormhole in question led to Universe Two, which she theorised to possibly be home to the Timeless Child's realm, although the Doctor was not so sure if that was the case. (TV: Survivors of the Flux)
The Daleks were capable of creating wormholes. (COMIC: Fire and Brimstone) They utilised a device known as a Oblivion Continuum, which drew power from a captured wormhole. Destruction of an Oblivion Continuum could destroy a planet. (TV: Victory of the Daleks)
Using Block Transfer Computations and wormhole technology, the Eleventh Doctor was able to connect the inside of the TARDIS and a safe Harry Houdini was locked inside. (PROSE: Houdini and The Space Cuckoos)
The Stingrays travelled from planet to planet through wormholes they created. In 2009, they created a wormhole between San Helios and Earth, through which the 200 bus arrived. The wormhole was eventually closed by Professor Malcolm Taylor before most of the Stingrays could get through, thus saving the world. Knowing the Stingrays would just generate another wormhole, the Doctor planned to "nudge" them onto uninhabited planets so the Stingrays could consume everything without harming anyone, (TV: Planet of the Dead)
In 2010, Wanda Rothman's team found and accidentally activated a vodium sample. It started creating wormholes at a scientific conference, which pulled in several scientists. The Eighth Doctor and his friends were able to neutralise the vodium. (AUDIO: Situation Vacant)