Psionics involve the use of the mind to alter or command reality, typically through some understanding of a deeper truth about the universe or command over a fundamental law of reality.
It’s pretty cool, but I have trouble thinking of media where it takes a prominent role. The few examples that come to mind are:
Star Wars - The Force Mass Effect - Biotics/Element Zero technology Stellaris - Spiritualist Ethos Warhammer 40k - Psykers/Orks
What are some other examples of psionics in Sci-Fi?
I don’t know about popular, but one of my favorite examples is Sid Meier’s Alpha Centauri. It’s an old game (1999) but I’ll put the psionic stuff in a spoiler tag because, If you like Civilization type games and want a good story, I think it’s worth going in blind and experiencing the story as it was intended.
SMAC plot spoilers
The game takes place on a planet around Alpha Centauri, generally referred to in-game as Planet. Just before the colony ship gets to Planet, disaster strikes, communications with Earth are lost, and the crew breaks into seven factions, one for each drop pod on the ship. The planet is dominated by a fungus that hosts a number of hostile native species, and these species use psionic attacks to paralyze their victims with horror before killing them.
As the player develops their civilization and discovers new techs, they learn that the alien animals are psionically linked to the fungus, which itself forms a Planet-spanning neural network. Over the course of the game, Planet begins to develop conscious thought and communicate with the humans, first through psionic dreams, later through specially constructed interfaces between the fungus and human tech.
I distinctly remember having my mind blown as the story unfolded. It’s been many years since I’ve thought about it; gonna have to dig it up and see if it’s as good as I remember it :)