A wormhole could connect extremely long distances such as a billion light years or additional, short distances such as a hardly any meters, different universes, or different points in time. A wormhole can be visualized as a tunnel with two ends at separate points in space-time.
Source:
[1] Wikipedia Contributors. “Wormhole.” Wikipedia, Wikimedia Foundation, 26 Nov. 2020, en.wikipedia.org/wiki/Wormhole. Accessed 29 Nov. 2020.
[2] Genty. “Wormhole Time Travel Portal – Free Photo on Pixabay.” Pixabay.com, 18 July 2017, pixabay.com/photos/wormhole-time-travel-portal-vortex-2514312/. Accessed 29 Nov. 2020.
[3] spirit111. “Pillars Of Creation Spiral Eddy – Free Photo on Pixabay.” Pixabay.com, 19 July 2017, pixabay.com/photos/pillars-of-creation-spiral-eddy-2519463/. Accessed 29 Nov. 2020.