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?
Peter F. Hamilton’s Greg Mandel trilogy - the titular character is a former psi-soldier turned mercenary. IIRC, candidate psi-soldiers are given a brain implant that squirts out psi juice on demand, and each soldier develops unique and unpredictable powers. Greg’s was the ability to sense, control, or kill other nearby minds.